#!/bin/bash
##
## License: GPL
## It can reinstall Debian, Ubuntu, Kali, AlpineLinux, CentOS, AlmaLinux, RockyLinux, Fedora and Windows OS via network automatically without any other external measures and manual operations.
## Default root password: LeitboGi0ro
## Written By MoeClub.org
## Blog: https://moeclub.org
## Modified By 秋水逸冰
## Blog: https://teddysun.com/
## Modified By VPS收割者
## Blog: https://www.idcoffer.com/
## Modified By airium
## Blog: https://github.com/airium
## Modified By 王煎饼
## Github: https://github.com/bin456789/
## Modified By nat.ee
## Forum: https://hostloc.com/space-uid-49984.html
## Modified By Leitbogioro
## Blog: https://www.zhihu.com/column/originaltechnic

# color
underLine='\033[4m'
aoiBlue='\033[36m'
blue='\033[34m'
yellow='\033[33m'
green='\033[32m'
red='\033[31m'
plain='\033[0m'

export tmpVER=''
export tmpDIST=''
export tmpURL=''
export tmpWORD=''
export tmpMirror=''
export tmpDHCP=''
export targetRelese=''
export targetLang='cn'
export TimeZone=''
export setIpStack=''
export ipAddr=''
export ipMask=''
export ipGate=''
export ipDNS='8.8.8.8 1.1.1.1'
export ip6Addr=''
export ip6Mask=''
export ip6Gate=''
export ip6DNS='2001:4860:4860::8888 2606:4700:4700::1111'
export IncDisk=''
export interface=''
export interfaceSelect=''
export setInterfaceName='0'
export autoPlugAdapter='1'
export IsCN=''
export Relese=''
export sshPORT=''
export ddMode='0'
export setNet='0'
export setNetbootXyz='0'
export setRDP='0'
export tmpSetIPv6=''
export setIPv6='1'
export setRaid=''
export setDisk=''
export partitionTable='mbr'
export setMemCheck='1'
export setCloudKernel=''
export isMirror='0'
export FindDists='0'
export setFileType=''
export loaderMode='0'
export setMotd=''
export setDns=''
export LANG="en_US.UTF-8"
export LANGUAGE="en_US:en"
export IncFirmware='0'
export SpikCheckDIST='0'
export UNKNOWHW='0'
export UNVER='6.4'
export GRUBDIR=''
export GRUBFILE=''
export GRUBVER=''
export VER=''
export setCMD=""
export setConsole=''
export setFail2ban=''
export setAutoConfig='1'
export FirmwareImage=''
export AddNum='1'
export DebianModifiedProcession=''

while [[ $# -ge 1 ]]; do
  case $1 in
    -version)
      shift
      tmpVER="$1"
      shift
      ;;
    -debian|-Debian)
      shift
      Relese='Debian'
      tmpDIST="$1"
      shift
      ;;
    -ubuntu|-Ubuntu)
      shift
      ddMode='1'
      finalDIST="$1"
      targetRelese='Ubuntu'
      shift
      ;;
    -kali|-Kali)
      shift
      Relese='Kali'
      tmpDIST="$1"
      shift
      ;;
    -centos|-CentOS|-cent|-Cent)
      shift
      Relese='CentOS'
      tmpDIST="$1"
      shift
      ;;
    -rocky|-rockylinux|-RockyLinux)
      shift
      Relese='RockyLinux'
      tmpDIST="$1"
      shift
      ;;
    -alma|-almalinux|-AlmaLinux)
      shift
      Relese='AlmaLinux'
      tmpDIST="$1"
      shift
      ;;
    -fedora|-Fedora)
      shift
      Relese='Fedora'
      tmpDIST="$1"
      shift
      ;;
    -alpine|-alpinelinux|-AlpineLinux|-alpineLinux)
      shift
      Relese='AlpineLinux'
      tmpDIST="$1"
      shift
      ;;
    -win|-windows)
      shift
      ddMode='1'
      finalDIST="$1"
      targetRelese='Windows'
      shift
      ;;
    -lang|-language)
      shift
      targetLang="$1"
      shift
      ;;
    -dd|--image)
      shift
      ddMode='1'
      tmpURL="$1"
      shift
      ;;
    --networkstack)
      shift
      setIpStack="$1"
      shift
      ;;
    --ip-addr)
      shift
      ipAddr="$1"
      shift
      ;;
    --ip-mask)
      shift
      ipMask="$1"
      shift
      ;;
    --ip-gate)
      shift
      ipGate="$1"
      shift
      ;;
    --ip-dns)
      shift
      ipDNS="$1"
      shift
      ;;
    --ip6-addr)
      shift
      ip6Addr="$1"
      shift
      ;;
    --ip6-mask)
      shift
      ip6Mask="$1"
      shift
      ;;
    --ip6-gate)
      shift
      ip6Gate="$1"
      shift
      ;;
    --ip6-dns)
      shift
      ip6DNS="$1"
      shift
      ;;
    --network)
      shift
      tmpDHCP="$1"
      shift
      ;;
    --adapter)
      shift
      interfaceSelect="$1"
      shift
      ;;
    --netdevice-unite)
      shift
      setInterfaceName='1'
      ;;
    --autoplugadapter)
      shift
      autoPlugAdapter="$1"
      shift
      ;;
    --loader)
      shift
      loaderMode='1'
      ;;
    --motd)
      shift
      setMotd='1'
      ;;
    --fail2ban)
      shift
      setFail2ban="$1"
      shift
      ;;
    --setdns)
      shift
      setDns='1'
      ;;
    -mirror)
      shift
      isMirror='1'
      tmpMirror="$1"
      shift
      ;;
    -rdp)
      shift
      setRDP='1'
      WinRemote="$1"
      shift
      ;;
    -raid)
      shift
      setRaid="$1"
      shift
      ;;
    -setdisk)
      shift
      setDisk="$1"
      shift
      ;;
    -partition)
      shift
      partitionTable="$1"
      shift
      ;;
    -timezone)
      shift
      TimeZone="$1"
      shift
      ;;
    -cmd)
      shift
      setCMD="$1"
      shift
      ;;
    -console)
      shift
      setConsole="$1"
      shift
      ;;
    -firmware)
      shift
      IncFirmware="1"
      shift
      ;;
    -cloudkernel)
      shift
      setCloudKernel="$1"
      shift
      ;;
    -filetype)
      shift
      setFileType="$1"
      shift
      ;;
    -port)
      shift
      sshPORT="$1"
      shift
      ;;
    -pwd)
      shift
      tmpWORD="$1"
      shift
      ;;
    --setipv6)
      shift
      tmpSetIPv6="$1"
      shift
      ;;
    --allbymyself)
      shift
      setAutoConfig='0'
      ;;
    --nomemcheck)
      shift
      setMemCheck='0'
      ;;
    -netbootxyz)
      shift
      setNetbootXyz='1'
      shift
      ;;
    *)
      if [[ "$1" != 'error' ]]; then echo -ne "\nInvaild option: '$1'\n\n"; fi
      echo -ne " Usage:\n\tbash $(basename $0)\t-debian       [${underLine}${yellow}dists-name${plain}]\n\t\t\t\t-ubuntu       [${underLine}dists-name${plain}]\n\t\t\t\t-kali         [${underLine}dists-name${plain}]\n\t\t\t\t-alpine         [${underLine}dists-name${plain}]\n\t\t\t\t-centos       [${underLine}dists-name${plain}]\n\t\t\t\t-rockylinux   [${underLine}dists-name${plain}]\n\t\t\t\t-almalinux    [${underLine}dists-name${plain}]\n\t\t\t\t-fedora       [${underLine}dists-name${plain}]\n\t\t\t\t-version      [32/i386|64/${underLine}${yellow}amd64${plain}|arm/${underLine}${yellow}arm64${plain}] [${underLine}${yellow}dists-verison${plain}]\n\t\t\t\t--ip-addr/--ip-gate/--ip-mask\n\t\t\t\t-apt/-yum/-mirror\n\t\t\t\t-dd/--image\n\t\t\t\t-pwd          [linux password]\n\t\t\t\t-port         [linux ssh port]\n"
      exit 1
      ;;
    esac
  done

# Check Root
[[ "$EUID" -ne '0' || $(id -u) != '0' ]] && echo -ne "\n[${red}Error${plain}] This script must be executed as root!\n\nTry to type:\n${yellow}sudo -s\n${plain}\nAfter entering the password, switch to root dir to execute this script:\n${yellow}cd ~${plain}\n\n" && exit 1

# Ping delay to YouTube($2), Instagram($3), Wikipedia($4) and BBC($5), support both IPv4 and IPv6 access, $1 is $IPStackType
function checkCN() {
  for TestUrl in "$2" "$3" "$4" "$5"; do
# "rtt" result of ping command of Alpine Linux is "round-trip" and it can't handle "sed -n" well.
    IPv4PingDelay=`ping -4 -c 2 -w 2 "$TestUrl" | grep "rtt\|round-trip" | cut -d'/' -f5 | awk -F'.' '{print $NF}' | sed -E '/^[0-9]\+\(\.[0-9]\+\)\?$/p'`
    IPv6PingDelay=`ping -6 -c 2 -w 2 "$TestUrl" | grep "rtt\|round-trip" | cut -d'/' -f5 | awk -F'.' '{print $NF}' | sed -E '/^[0-9]\+\(\.[0-9]\+\)\?$/p'`
    if [[ "$1"="BiStack" ]]; then
      [[ "$IPv4PingDelay" != "" || "$IPv6PingDelay" != "" ]] && tmpIsCN+="" || tmpIsCN+="cn"
    elif [[ "$1"="IPv4Stack" ]]; then
      [[ "$IPv4PingDelay" != "" ]] && tmpIsCN+="" || tmpIsCN+="cn"
    elif [[ "$1"="IPv6Stack" ]]; then
      [[ "$IPv6PingDelay" != "" ]] && tmpIsCN+="" || tmpIsCN+="cn"
    fi
  done
# If testing servers are all unaccessible, the server may be in mainland of China.
  [[ $(echo $tmpIsCN | grep -o "cn" | wc -l) == "4" ]] && { IsCN="cn"; ipDNS="119.29.29.29 223.6.6.6"; ip6DNS="2402:4e00:: 2400:3200::1"; }
}

# "$1" is "$ipDNS" or "$ip6DNS"
# The delimiter of several dns settings in automatic response file of Debian is " "(space), for RedHat, it's ","(comma).
# Reference: https://lists.debian.org/debian-user/2009/10/msg00149.html
#            https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/installation_guide/sect-kickstart-syntax
function checkDNS() {
  if [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then   
    tmpDNS=`echo $1 | sed 's/ /,/g'`
    echo "$tmpDNS"
  else
    echo "$1"
  fi
}

function dependence() {
  Full='0';
  for BIN_DEP in `echo "$1" |sed 's/,/\n/g'`
    do
      if [[ -n "$BIN_DEP" ]]; then
        Found='0';
        for BIN_PATH in `echo "$PATH" |sed 's/:/\n/g'`
          do
            ls $BIN_PATH/$BIN_DEP >/dev/null 2>&1;
            if [ $? == '0' ]; then
              Found='1';
              break;
            fi
          done
        if [ "$Found" == '1' ]; then
          echo -en "[${green}ok${plain}]\t";
        else
          Full='1';
          echo -en "[${red}Not Install${plain}]";
        fi
        echo -en "\t$BIN_DEP\n";
      fi
    done
  if [ "$Full" == '1' ]; then
    echo -ne "\n[${red}Error${plain}] Please use '${yellow}apt-get${plain}' or '${yellow}yum / dnf${plain}' install it. \n\n"
    exit 1;
  fi
}

function selectMirror() {
  [ $# -ge 3 ] || exit 1
  Relese=$(echo "$1" |sed -r 's/(.*)/\L\1/')
  DIST=$(echo "$2" |sed 's/\ //g' |sed -r 's/(.*)/\L\1/')
  VER=$(echo "$3" |sed 's/\ //g' |sed -r 's/(.*)/\L\1/')
  New=$(echo "$4" |sed 's/\ //g')
  [ -n "$Relese" ] && [ -n "$DIST" ] && [ -n "$VER" ] || exit 1
  if [ "$Relese" == "debian" ] || [ "$Relese" == "ubuntu" ] || [ "$Relese" == "kali" ]; then
    [ "$DIST" == "focal" ] && legacy="legacy-" || legacy=""
    TEMP="SUB_MIRROR/dists/${DIST}/main/installer-${VER}/current/${legacy}images/netboot/${Relese}-installer/${VER}/initrd.gz"
    [[ "$Relese" == "kali" ]] && TEMP="SUB_MIRROR/dists/${DIST}/main/installer-${VER}/current/images/netboot/debian-installer/${VER}/initrd.gz"
  elif [ "$Relese" == "centos" ] || [ "$Relese" == "rockylinux" ] || [ "$Relese" == "almalinux" ]; then
    if [ "$Relese" == "centos" ] && [[ "$RedHatSeries" -le "7" ]]; then
      TEMP="SUB_MIRROR/${DIST}/os/${VER}/images/pxeboot/initrd.img"
    else
      TEMP="SUB_MIRROR/${DIST}/BaseOS/${VER}/os/images/pxeboot/initrd.img"
    fi
  elif [ "$Relese" == "fedora" ]; then
    TEMP="SUB_MIRROR/releases/${DIST}/Server/${VER}/os/images/pxeboot/initrd.img"
  elif [ "$Relese" == "alpinelinux" ]; then
    TEMP="SUB_MIRROR/${DIST}/releases/${VER}/netboot/initramfs-lts"
  fi
  [ -n "$TEMP" ] || exit 1
  mirrorStatus=0
  declare -A MirrorBackup
  if [[ "$IsCN" == "cn" ]]; then
    MirrorBackup=(["debian0"]="" ["debian1"]="http://ftp.cn.debian.org/debian" ["debian2"]="http://mirror.nju.edu.cn/debian" ["debian3"]="http://mirrors.ustc.edu.cn/debian" ["debian4"]="https://mirrors.aliyun.com/debian-archive/debian" ["ubuntu0"]="" ["ubuntu1"]="https://mirrors.ustc.edu.cn/ubuntu" ["ubuntu2"]="http://mirrors.xjtu.edu.cn/ubuntu" ["kali0"]="" ["kali1"]="https://mirrors.tuna.tsinghua.edu.cn/kali" ["kali2"]="http://mirrors.zju.edu.cn/kali" ["alpinelinux0"]="" ["alpinelinux1"]="http://mirror.nju.edu.cn/alpine" ["alpinelinux2"]="http://mirrors.tuna.tsinghua.edu.cn/alpine" ["centos0"]="" ["centos1"]="https://mirrors.ustc.edu.cn/centos-stream" ["centos2"]="https://mirrors.bfsu.edu.cn/centos-stream" ["centos3"]="https://mirrors.tuna.tsinghua.edu.cn/centos" ["centos4"]="http://mirror.nju.edu.cn/centos-altarch" ["centos5"]="https://mirrors.tuna.tsinghua.edu.cn/centos-vault" ["fedora0"]="" ["fedora1"]="https://mirrors.tuna.tsinghua.edu.cn/fedora" ["fedora2"]="https://mirrors.bfsu.edu.cn/fedora" ["rockylinux0"]="" ["rockylinux1"]="http://mirror.nju.edu.cn/rocky" ["rockylinux2"]="http://mirrors.sdu.edu.cn/rocky" ["almalinux0"]="" ["almalinux1"]="https://mirror.sjtu.edu.cn/almalinux" ["almalinux2"]="http://mirrors.neusoft.edu.cn/almalinux")
  else
    MirrorBackup=(["debian0"]="" ["debian1"]="http://deb.debian.org/debian" ["debian2"]="http://mirrors.ocf.berkeley.edu/debian" ["debian3"]="http://ftp.yz.yamagata-u.ac.jp/pub/linux/debian" ["debian4"]="http://archive.debian.org/debian" ["ubuntu0"]="" ["ubuntu1"]="http://archive.ubuntu.com/ubuntu" ["ubuntu2"]="http://ports.ubuntu.com" ["kali0"]="" ["kali1"]="https://mirrors.ocf.berkeley.edu/kali" ["kali2"]="http://ftp.yz.yamagata-u.ac.jp/pub/linux/kali" ["alpinelinux0"]="" ["alpinelinux1"]="http://dl-cdn.alpinelinux.org/alpine" ["alpinelinux2"]="https://mirrors.edge.kernel.org/alpine" ["centos0"]="" ["centos1"]="http://mirror.stream.centos.org" ["centos2"]="http://mirrors.ocf.berkeley.edu/centos-stream" ["centos3"]="http://mirror.centos.org/centos" ["centos4"]="http://mirror.centos.org/altarch" ["centos5"]="http://vault.centos.org" ["fedora0"]="" ["fedora1"]="http://mirrors.rit.edu/fedora/fedora/linux" ["fedora2"]="http://ftp.iij.ad.jp/pub/linux/Fedora/fedora/linux" ["rockylinux0"]="" ["rockylinux1"]="http://download.rockylinux.org/pub/rocky" ["rockylinux2"]="http://mirrors.iu13.net/rocky" ["almalinux0"]="" ["almalinux1"]="http://repo.almalinux.org/almalinux" ["almalinux2"]="http://ftp.iij.ad.jp/pub/linux/almalinux")
  fi
  echo "$New" | grep -q '^http://\|^https://\|^ftp://' && MirrorBackup[${Relese}0]="${New%*/}"
  for mirror in $(echo "${!MirrorBackup[@]}" |sed 's/\ /\n/g' |sort -n |grep "^$Relese"); do
    Current="${MirrorBackup[$mirror]}"
    [ -n "$Current" ] || continue
    MirrorURL=`echo "$TEMP" |sed "s#SUB_MIRROR#${Current}#g"`
    wget --no-check-certificate --spider --timeout=3 -o /dev/null "$MirrorURL"
    [ $? -eq 0 ] && mirrorStatus=1 && break
  done
  [ $mirrorStatus -eq 1 ] && echo "$Current" || exit 1
}

function getIPv4Address() {
# Differences from scope link, scope host and scope global of IPv4, reference: https://qiita.com/testnin2/items/7490ff01a4fe1c7ad61f
  allI4Addrs=`ip -4 addr show | grep -wA 256 "$interface4" | grep -wv "lo\|host" | grep -w "inet" | grep -w "scope global*\|link*" | awk -F " " '{for (i=2;i<=NF;i++)printf("%s ", $i);print ""}' | awk '{print$1}'`
  iAddr=`echo "$allI4Addrs" | head -n 1`
  iAddrNum=`echo "$allI4Addrs" | wc -l`
  collectAllIpv4Addresses "$iAddrNum"
  ipAddr=`echo ${iAddr} | cut -d'/' -f1`
  ipPrefix=`echo ${iAddr} | cut -d'/' -f2`
  ipMask=`netmask "$ipPrefix"`
# Get real IPv4 subnet of current System
  ip4RouteScopeLink=`ip -4 route show scope link | grep -iv "warp\|wgcf\|wg[0-9]\|docker[0-9]" | grep -w "$interface4" | grep -w "$ipAddr" | grep -m1 -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -n 1`
  actualIp4Prefix=`ip -4 route show scope link | grep -iv "warp\|wgcf\|wg[0-9]\|docker[0-9]" | grep -w "$interface4" | grep -w "$ip4RouteScopeLink" | head -n 1 | awk '{print $1}' | awk -F '/' '{print $2}'`
  [[ -z "$actualIp4Prefix" ]] && actualIp4Prefix="$ipPrefix"
  actualIp4Subnet=`netmask "$actualIp4Prefix"`
# In most situation, at least 99.9% probability, the first hop of the network should be the same as the available gateway. 
# But in 0.1%, they are actually different. 
# Because one of the first hop of a tested machine is 5.45.72.1, I told Debian installer this router as a gateway 
# But installer said the correct gateway should be 5.45.76.1, in a typical network, for example, your home, 
# the default gateway is the same as the first route hop of the machine, it may be 192.168.0.1.
# If possible, we should configure out the real available gateway of the network.
  FirstRoute=`ip -4 route show default | grep -iv "warp\|wgcf\|wg[0-9]\|docker[0-9]" | grep -w "via" | grep -w "dev $interface4*" | head -n 1 | awk -F " " '{for (i=3;i<=NF;i++)printf("%s ", $i);print ""}' | awk '{print$1}'`
# We should find it in ARP, the first hop IP and gateway IP is managed by the same device, use device mac address to configure it out.
  RouterMac=`arp -n | grep "$FirstRoute" | awk '{print$3}'`
  FrFirst=`echo "$FirstRoute" | cut -d'.' -f 1,2`
  FrThird=`echo "$FirstRoute" | cut -d'.' -f 3`
# Print all matched available gateway.
  ipGates=`ip -4 route show | grep -iv "warp\|wgcf\|wg[0-9]\|docker[0-9]" | grep -v "via" | grep -w "dev $interface4*" | grep -w "proto*" | grep -w "scope global\|link src $ipAddr*" | awk '{print$1}'`
# Figure out the line of this list.
  ipGateLine=`echo "$ipGates" | wc -l`
# The line determines the cycling times.
  for ((i=1; i<="$ipGateLine"; i++)) do
# Current one gateway of the ip gateways. the formart is as of 10.0.0.0/22
    tmpIpGate=`echo "$ipGates" | sed -n ''$i'p'`
# Intercept a standard IPv4 address.
    tmpIgAddr=`echo $tmpIpGate | cut -d'/' -f1`
# Intercept the prefix of the gateway.
    tmpIgPrefix=`echo $tmpIpGate | cut -d'/' -f2`
# Calculate the first ip in all network segment, it should be the the same range with gateway in this network.
    minIpGate=`ipv4Calc "$tmpIgAddr" "$tmpIgPrefix" | grep "FirstIP:" | awk '{print$2}'`
# Intercept the A and B class of the current ip address of gateway.
    tmpIpGateFirst=`echo "$minIpGate" | cut -d'.' -f 1,2`
    tmpIpGateThird=`echo "$minIpGate" | cut -d'.' -f 3`
# If the class A and B class of the current local ip address is as same as current gateway, this gateway may a valid one.
    [[ "$FrFirst" == "$tmpIpGateFirst" ]] && {
      if [[ "$FrThird" == "$tmpIpGateThird" ]]; then
        ipGate="$FirstRoute"
        break
      elif [[ "$FrThird" != "$tmpIpGateThird" ]]; then
# The A, B and C class address of min ip gate. 
        tmpMigFirst=`echo $minIpGate | cut -d'.' -f 1,2,3`
# Search it in ARP, it's belonged to the same network device which has been distinguished by mac address of first hop of the IP.
        ipGate=`arp -n | grep "$tmpMigFirst" | grep "$RouterMac" | awk '{print$1}'`
        break
      fi	  
    }
  done
# If there is no one of other gateway in this current network, use if access the public internet, the first hop route of this machine as the gateway.
  [[ "$ipGates" == "" || "$ipGate" == "" ]] && ipGate="$FirstRoute"
  transferIPv4AddressFormat "$ipAddr" "$ipGate"
}

# $1 is "$ipAddr", $2 is "$ipGate".
function transferIPv4AddressFormat() {
# Some cloud providers like Godaddy, Arkecx, Hetzner(include DHCP) etc, the subnet mask of IPv4 static network configuration of their original template OS is incorrect.
# The following is the sample:
#
# auto eth0
#   iface eth0 inet static
#     address 190.168.23.175
#     netmask 255.255.255.240
#     dns-nameservers 8.8.8.8 8.8.4.4
#     up ip -4 route add default via 169.254.0.1 dev eth0 onlink
#
# The netmask tells the total number of IP in the network is only 15(240 - 255),
# but we obsessed that there are more than 15 IPv4 addresses between 169.254.0.1 and 190.168.23.175 clearly.
# So if netmask is 255.255.255.240(prefix is 28), the computer only find IP between 190.168.23.160 and 190.168.23.175,
# the gateway 169.254.0.1 is obviously not be included in this range.
# So we need to expand the range of the netmask(reduce the value number of the prefix) to make sure the IPv4 gateway can be contained.
# If this mistake has not be repaired, Debian installer will return error "untouchable gateway".
# DHCP IPv4 network(even IPv4 netmask is "32") may not be effected by this situation.
# The following consulted calculations are calculated by Vultr IPv4 subnet calculator, reference: https://www.vultr.com/resources/subnet-calculator/
  ipv4SubnetCertificate "$1" "$2"
  ipPrefix="$tmpIpMask"
  ipMask=`netmask "$tmpIpMask"`
# Some servers' provided by Hetzner are so confused because the IPv4 configurations of them are static but they are not fitted with standard, here is a sample:
#
# auto ens3
# iface ens3 inet static
#     address: 89.163.208.5
#     netmask: 255.255.255.0
#     broadcast +
#     up ip -f inet route add 169.254.0.1 dev ens3
#     up ip -f inet route add default via 169.254.0.1 dev ens3
#
# The A class of address and gateway are entirely different, although we should make sure the value of the suggested subnet mask is "128.0.0.1"(prefix "1")
# to expand IPv4 range as large as possible, but in above situation, the largest IPv4 range is from 0.0.0.0 to 127.255.255.255, the IPv4 gate "169.254.0.1"
# can't be included, so the reserve approach is to get the result of "ip -4 route show scope link"(89.163.208.0/24) to ensure the correct subnet and gateway,
# then we can fix these weird settings from incorrect network router.
# IPv4 network from Hetzner support dhcp even though it's configurated by static in "/etc/network/interfaces".
  # ip4RangeFirst=`ipv4Calc "$1" "$actualIp4Prefix" | grep "FirstIP:" | awk '{print$2}' | cut -d'.' -f1`
  # ip4RangeLast=`ipv4Calc "$1" "$actualIp4Prefix" | grep "LastIP:" | awk '{print$2}' | cut -d'.' -f1`
  ip4AddrFirst=`echo $1 | cut -d'.' -f1`
  ip4AddrSecond=`echo $1 | cut -d'.' -f2`
  ip4GateFirst=`echo $2 | cut -d'.' -f1`
  ip4GateSecond=`echo $2 | cut -d'.' -f2`
# Common ranges of IPv4 intranet:
# Reference: https://hczhang.cn/network/reserved-ip-addresses.html
  [[ "$ip4AddrFirst""$ip4AddrSecond" != "$ip4GateFirst""$ip4GateSecond" ]] && {
    checkIfIpv4AndIpv6IsLocalOrPublic "$2" ""
    [[ "$ipv4LocalOrPublicStatus" == '1' ]] || [[ "$ip4AddrFirst" != "$ip4GateFirst" ]] || [[ "$ip4AddrSecond" != "$ip4GateSecond" ]] && {
      # [[ -z "$ip4RouteScopeLink" ]] && ipGate=`ipv4Calc "$1" "$ipPrefix" | grep "FirstIP:" | awk '{print$2}'` || ipGate=`ipv4Calc "$ip4RouteScopeLink" "$ipPrefix" | grep "FirstIP:" | awk '{print$2}'`
      if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]] || [[ "$linux_relese" == 'alpinelinux' ]]; then
        ipPrefix="$actualIp4Prefix"
        ipMask="$actualIp4Subnet"
        Network4Config="isStatic"
# Redirecting all actual names of network adapters to "eth0", "eth1"... by force aims to make a convenience to adding gateway(route) in soft hacking process.
        setInterfaceName='1'
      fi
# Temporary installation of Debian 12 and Kali can't handle IPv4 public address and IPv4 private gateway well, so we prefer to invoke irregular IPv6 parameters to configure network in "busybox" and write static configs for IPv4 in later stage of the installation.
      [[ "$IPStackType" == "BiStack" ]] && {
        [[ "$linux_relese" == 'debian' || "$linux_relese" == 'kali' ]] && {
          BiStackPreferIpv6Status='1'
        }
      }
# Installation environment of Debian 11 and former releases can't handle either irregular(gateway is not within the range of which is calculated by IP/mask) IPv4 or IPv6 parameters, so we need to execute a "ip route add" trick to make sure the networking of pure IPv4 stack servers works normally in "busybox".
      [[ "$IPStackType" == "IPv4Stack" || "$linux_relese" == 'alpinelinux' ]] && BurnIrregularIpv4Status='1'
    }
  }
  [[ "$interfacesNum" -ge "2" ]] && {
# If there are two and more network adapters on the system like "eth0" and "eth1" and the first adapter "eth0" plays a role of connecting to the public network by dhcp method,
# AlpineLinux will prefer to use the last order of the adapter like "eth1" to configure the network instead of "eth0" if assign "ip=dhcp" parameter to the netboot kernel,
# so we need to switch the network configuration method to static to make sure the expect valid network adapter "eth0" can be activated.
    [[ "$linux_relese" == 'alpinelinux' ]] && Network4Config="isStatic"
  }
}

function netmask() {
  n="${1:-32}"
  b=""
  m=""
  for((i=0;i<32;i++)){
    [ $i -lt $n ] && b="${b}1" || b="${b}0"
  }
  for((i=0;i<4;i++)){
    s=`echo "$b"|cut -c$[$[$i*8]+1]-$[$[$i+1]*8]`
    [ "$m" == "" ] && m="$((2#${s}))" || m="${m}.$((2#${s}))"
  }
  echo "$m"
}

# $1 is IPv4 address, $2 is IPv4 subnet.
function ipv4Calc() {
  tmpIp4="$1"
  tmpIp4Mask=`netmask "$2"`

  IFS=. read -r i1 i2 i3 i4 <<< "$tmpIp4"
  IFS=. read -r m1 m2 m3 m4 <<< "$tmpIp4Mask"

  tmpNetwork="$((i1 & m1)).$((i2 & m2)).$((i3 & m3)).$((i4 & m4))"
  tmpBroadcast="$((i1 & m1 | 255-m1)).$((i2 & m2 | 255-m2)).$((i3 & m3 | 255-m3)).$((i4 & m4 | 255-m4))"
  tmpFirstIP="$((i1 & m1)).$((i2 & m2)).$((i3 & m3)).$(((i4 & m4)+1))"
  tmpFiLast="$(echo "$tmpFirstIP" | cut -d'.' -f 4)"
  FirstIP="$tmpFirstIP"
  tmpLastIP="$((i1 & m1 | 255-m1)).$((i2 & m2 | 255-m2)).$((i3 & m3 | 255-m3)).$(((i4 & m4 | 255-m4)-1))"
  tmpLiLast="$(echo "$tmpLastIP" | cut -d'.' -f 4)"
  LastIP="$tmpLastIP"
  [[ "$tmpFiLast" > "$tmpLiLast" ]] && {
    FirstIP="$tmpLastIP"
    LastIP="$tmpFirstIP"
  }
  [[ "$2" > "31" ]] && {
    FirstIP="$tmpNetwork"
    LastIP="$tmpNetwork"
  }
  echo -e "Network:   $tmpNetwork\nBroadcast: $tmpBroadcast\nFirstIP:   $FirstIP\nLastIP:    $LastIP\n"
}

# Unsuitable settings of subnet will cause not only "Death Red" of Debian installer which is called "unreachable gateway"
# but also contributes to some additional negative results as of if it's wider than the actual,
# this host will lose communications with some other servers which are serving in public internet because these will be treated as intranet hosts.
# To the opposite, if the subnet of one server is narrower than the actual, this host will lose communications with some local hosts because these will be treated as public servers.
# As an environment of a VPS, a narrower subnet causes less bad subsequentials than a wider prefer because VPS is usually be used by individual.
# If it's in a cluster such as home, office or company which is a place of that usually needs to transmit data with other hosts within LAN(local area network),
# the better opinion is to setting a wider value if you don't know them well.
# To figure out the most suitable subnet of a class segment of one IP or just a specific IP address,
# you can visit: https://bgp.tools/ which allows you to inquire announced allocations of IP addresses that were assigned by Internet Organizations.
#
# $1 is "$ipAddr", $2 is "$ipGate"
function ipv4SubnetCertificate() {
# If the IP and gateway are not in the same IPv4 A class, the prefix of netmask should be "1", transfer to whole IPv4 address is 128.0.0.1
# The range of 190.168.23.175/1 is 128.0.0.0 - 255.255.255.255, the gateway 169.254.0.1 can be included.
  [[ `echo $1 | cut -d'.' -f 1` != `echo $2 | cut -d'.' -f 1` ]] && tmpIpMask="1"
# If the IP and gateway are in the same IPv4 A class, not in the same IPv4 B class, the prefix of netmask should less equal than "8", transfer to whole IPv4 address is 255.0.0.0
# The range of 190.168.23.175/8 is 190.0.0.0 - 190.255.255.255, the gateway 169... can't be included.
  [[ `echo $1 | cut -d'.' -f 1` == `echo $2 | cut -d'.' -f 1` ]] && tmpIpMask="8"
# If the IP and gateway are in the same IPv4 A B class, not in the same IPv4 C class, the prefix of netmask should less equal than "16", transfer to whole IPv4 address is 255.255.0.0
# The range of 190.168.23.175/16 is 190.168.0.0 - 190.168.255.255, the gateway 169... can't be included.
  [[ `echo $1 | cut -d'.' -f 1,2` == `echo $2 | cut -d'.' -f 1,2` ]] && tmpIpMask="16"
# If the IP and gateway are in the same IPv4 A B C class, not in the same IPv4 D class, the prefix of netmask should less equal than "24", transfer to whole IPv4 address is 255.255.255.0
# The range of 190.168.23.175/24 is 190.168.23.0 - 190.168.23.255, the gateway 169... can't be included.
  [[ `echo $1 | cut -d'.' -f 1,2,3` == `echo $2 | cut -d'.' -f 1,2,3` ]] && tmpIpMask="24"
# So in summary of the IPv4 sample in above, we should assign subnet mask "128.0.0.1"(prefix "1") for it.
}

# $1 is "$setDisk", $2 is "linux_relese"
function getDisk() {
# $disks is definited as the default disk, if server has 2 and more disks, the first disk will be responsible of the grub booting.
  rootPart=`lsblk -ip | grep -v "fd[0-9]*\|sr[0-9]*\|ram[0-9]*\|loop[0-9]*" | sed 's/[[:space:]]*$//g' | grep -w "part /\|part /boot" | head -n 1 | cut -d' ' -f1 | sed 's/..//'`
  # majorMin=`lsblk -ip | grep -w "$rootPart" | head -n 1 | awk '{print $2}' | sed -r 's/:(.*)/:0/g'`
  diskSuffix=${rootPart: -4}
# ssd like NVMe(/dev/nvme0n1), MMC sd card(/dev/mmcblk0) are parted with "p number" suffix like: "/dev/nvme0n1p1" "/dev/mmcblk0p2",
# The partitions of vda and sda devices are ended with number "/dev/sda1" "/dev/vda2".
  [[ -n `echo $diskSuffix | grep -o "[0-9]p[0-9]"` ]] && disks=`echo $rootPart | sed 's/p[0-9]*.$//'` || disks=`echo $rootPart | sed 's/[0-9]*.$//'`
  # disks=`lsblk -ip | grep -w "$majorMin" | head -n 1 | awk '{print $1}'`
  [[ -z "$disks" ]] && disks=`lsblk -ip | grep -v "fd[0-9]*\|sr[0-9]*\|ram[0-9]*\|loop[0-9]*" | sed 's/[[:space:]]*$//g' | grep -w "disk /\|disk /boot" | head -n 1 | cut -d' ' -f1`
  [[ -z "$disks" ]] && disks=`lsblk -ip | grep -v "fd[0-9]*\|sr[0-9]*\|ram[0-9]*\|loop[0-9]*" | sed 's/[[:space:]]*$//g' | grep -w "disk" | grep -i "[0-9]g\|[0-9]t\|[0-9]p\|[0-9]e\|[0-9]z\|[0-9]y" | head -n 1 | cut -d' ' -f1`
  [ -n "$disks" ] || echo ""
  echo "$disks" | grep -q "/dev"
  [ $? -eq 0 ] && IncDisk="$disks" || IncDisk="/dev/$disks"
  AllDisks=""
# Find all disks on this server.
  for Count in `lsblk -ipd | grep -v "fd[0-9]*\|sr[0-9]*\|ram[0-9]*\|loop[0-9]*" | sed 's/[[:space:]]*$//g' | grep -w "disk" | grep -i "[0-9]g\|[0-9]t\|[0-9]p\|[0-9]e\|[0-9]z\|[0-9]y" | cut -d' ' -f1`; do
    AllDisks+="$Count "
  done
  AllDisks=$(echo "$AllDisks" | sed 's/.$//')
# All numbers of disks' statistic of this server.
  disksNum=$(echo $AllDisks | grep -o "/dev/*" | wc -l)

# Some cloud providers using first SCSI/SATA device like "sda" to mount ISO image instead of using "sr0":
#
# root@node:~# lsblk -ipf
# NAME        FSTYPE  FSVER            LABEL  UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
# /dev/sda    iso9660 Joliet Extension cidata 2023-07-13-09-35-07-00
# /dev/sr0
# /dev/vda
# |-/dev/vda1
# |-/dev/vda2 vfat    FAT32                   0BBB-E1CA                            119.9M  0%     /boot/efi
# `-/dev/vda3 xfs                             0c93f6bc-ef9c-468d-be02-84b4a70d3678 44.4G   11%    /
#
# Because of "sda" can't be written, If system is selected to install on "sda", the installation will meet a fatal,
# So we should exclude all these devices.
  for (( d=1; d<=$disksNum; d++ )); do
    currentDisk=$(echo "$AllDisks" | cut -d' ' -f$d)
    checkIfIsoPartition=$(lsblk -ipf | grep "$currentDisk" | head -n 1 | awk '{print $2}' | grep -i "iso")
    [[ -z "$checkIfIsoPartition" ]] && tmpAllDisks+="$currentDisk "
  done
  tmpAllDisks=$(echo "$tmpAllDisks" | sed 's/.$//')

  [[ "$AllDisks" != "$tmpAllDisks" ]] && {
    AllDisks="$tmpAllDisks"
    disksNum=$(echo $AllDisks | grep -o "/dev/*" | wc -l)
    [[ "$IncDisk" =~ "$AllDisks" ]] || IncDisk=$(echo "$AllDisks" | cut -d' ' -f1)
  }

# Allow user to install system to one disk manually.
  [[ -n "$1" && "$1" =~ ^[a-z0-9]+$ && "$1" != "all" ]] && {
    [[ "$1" =~ "/dev/" ]] && IncDisk="$1" || IncDisk="/dev/$1"
  }

# Remove all lvm volumes by force for Debian and Kali.
  [[ -z "$1" && "$disksNum" -ge "2" && -n $(lsblk -ip | awk '{print $6}' | grep -io "lvm") ]] && {
    [[ "$2" == 'debian' || "$2" == 'kali' ]] && setDisk="all"
  }
}

function diskType() {
  echo `udevadm info --query all "$1" 2>/dev/null |grep 'ID_PART_TABLE_TYPE' |cut -d'=' -f2`
}

# $1 is "$setRaid", $2 is "$disksNum", $3 is "$AllDisks", $4 is "$linux_relese".
function setRaidRecipe() {
  [[ -n "$1" ]] && {
# Soft Raid 0, 1, 5, 6 and 10 methods are supported by Debian, only one disk can't be as a component for any Raid method. 
# Raid 0 needs at least two disks, all space of the disks will be exploited, and it's the most dangerous for the safety of the data.
# Raid 1 needs at least two disks, the space can be exploited is always equal one disk, it's safest for the date but a bit wasteful.
# Raid 5 needs at least three disks, it storages data on two disks and storages parity checking data on one disk, it's not save on any single disk over 4TB.
# Raid 6 needs at least four disks, it's an enhanced version of Raid 5, it uses two parity stripes by practicing of dividing data across the set of drives, 
# it allows for two disk failures within the RAID set before any data is lost.
# Raid 10 needs at least four disks, it's a combination of Raid 0 and Raid 1, the disk 0 and disk 1 as a set of Raid 0, the same as disk 2 and disk 3,
# and then the sets of disk 0,1 and disk 2,3 are composed as one Raid 1.
# These Raid recipes are also applicable to Kali, fuck Canonical again! you deperated the compatibility of "preseed.cfg" installation procession from Ubuntu 22.04 and later.
    if [[ "$1" == "0" || "$1" == "1" || "$1" == "5" || "$1" == "6" || "$1" == "10" ]]; then
      [[ "$1" == "0" || "$1" == "1" ]] && [[ "$2" -lt "2" ]] && {
        echo -ne "\n[${red}Error${plain}] There are $2 drives on your machine, Raid $1 partition recipe only supports a basic set of dual drive or more!\n"
        exit 1
      }
      [[ "$1" == "5" ]] && [[ "$2" -lt "3" ]] && {
        echo -ne "\n[${red}Error${plain}] There are $2 drives on your machine, Raid $1 partition recipe only supports a basic set of triple drive or more!\n"
        exit 1
      }
      [[ "$1" == "6" || "$1" == "10" ]] && [[ "$2" -lt "4" ]] && {
        echo -ne "\n[${red}Error${plain}] There are $2 drives on your machine, Raid $1 partition recipe only supports a basic set of quad drive or more!\n"
        exit 1
      }
    else
      echo -ne "\n[${red}Error${plain}] Raid $1 partition recipe is not suitable, only Raid 0, 1, 5, 6 or 10 is supported!\n"
      exit 1
    fi
    if [[ "$4" == 'debian' ]] || [[ "$4" == 'kali' ]]; then
      for (( r=1;r<="$2";r++ )); do
        tmpAllDisksPart=`echo "$3" | cut -d ' ' -f"$r"`
# Some NVME controller hard drives like "/dev/nvme0n1" etc are end of a number in there names must add "p" with partition numbers for "d-i partman-auto-raid/recipe string",
# SCSI controller or Virtual controller drives like "/dev/sda" or "/dev/vda" are not effected by this situation.
# Drives and their partitions must be connected with "#" like "/dev/nvme0n1p2#/dev/nvme0n2p2".
        echo "${tmpAllDisksPart: -1}" | [[ -n "`sed -n '/^[0-9][0-9]*$/p'`" ]] && tmpAllDisksPart="$tmpAllDisksPart""p" || tmpAllDisksPart="$tmpAllDisksPart"
        AllDisksPart1+="$tmpAllDisksPart""1#"
        AllDisksPart2+="$tmpAllDisksPart""2#"
        AllDisksPart3+="$tmpAllDisksPart""3#"
      done
      AllDisksPart1=`echo "$AllDisksPart1" | sed 's/.$//'`
      AllDisksPart2=`echo "$AllDisksPart2" | sed 's/.$//'`
      AllDisksPart3=`echo "$AllDisksPart3" | sed 's/.$//'`
# Remove existed raid md devices without confirming; select raid recipe and all disks; don't assign swap; when one device on raid 1 is offline, the system still can be booted.
# Reference: https://wiki.ubuntu.com/BootDegradedRaid
      RaidRecipes=`echo -e "d-i partman-md/confirm boolean true
d-i partman-md/confirm_nooverwrite boolean true
d-i partman-md/confirm_nochanges boolean false
d-i partman-basicfilesystems/no_swap boolean false
d-i partman-auto/method string raid
d-i partman-auto/disk string $3
d-i mdadm/boot_degraded boolean true"`
# In environment of UEFI firmware motherboard computers, it's not suggested to creat any Raid recipe for "/boot/efi" partition,
# in any virtual machine which created by VMware Workstation Pro, version up to the current 17.0.2(2023/6), host OS is Windows 10 Enterprise x64,
# we must assign an additional Raid 1 recipe for "/boot" partition to prevent the case of following to happen：
# otherwise except of the first reboot of the Debian 12 installed soon, the next time hard reboot the system, it will failed into "GNU GRUB version 2.0x"
# and we must type "exit" to fallback to "Boot Manager", select and enter the default opinion of "Boot normally" and then find that Debian can be booted by grub.
# This is a particularly fatal for those servers which has no permission to access VNC in website back-end management and impossible to manipulate UEFI boot manager to boot the system normally.
      if [[ "$EfiSupport" == "enabled" ]]; then
        FormatDisk=`echo -e "$RaidRecipes
d-i partman-auto-raid/recipe string     \
    1  $2 0 ext4 /boot $AllDisksPart2 . \
    $1 $2 0 ext4 /     $AllDisksPart3 .
d-i partman-auto/expert_recipe string multiraid ::                                                                \
    1075 100 2150 free \\$bootable{ } \\$primary{ } method{ efi } \\$iflabel{ gpt } \\$reusemethod{ } format{ } . \
    269  150 538  raid                \\$primary{ } method{ raid } .                                              \
    100  200 -1   raid                \\$primary{ } method{ raid } .
d-i partman-efi/non_efi_system boolean true
d-i partman-partitioning/choose_label select gpt
d-i partman-partitioning/default_label string gpt"`
      else
# GPT table partition should not be included in BIOS Raid recipes so that it will cause Debian installer "Unable to install GRUB in /dev/sda" by installing grub.
        FormatDisk=`echo -e "$RaidRecipes
d-i partman-auto-raid/recipe string     \
    1  $2 0 ext4 /boot $AllDisksPart1 . \
    $1 $2 0 ext4 /     $AllDisksPart2 .
d-i partman-auto/expert_recipe string multiraid ::                   \
    1075 100 2150 raid \\$bootable{ } \\$primary{ } method{ raid } . \
    100  200 -1   raid                \\$primary{ } method{ raid } .
"`
      fi
# Reference: https://github.com/airium/Linux-Reinstall/blob/master/install-raid0.sh
#            https://www.debian.org/releases/bookworm/example-preseed.txt
#            https://www.cnblogs.com/zhangshan-log/articles/14542166.html
#            https://gist.github.com/jnerius/6573343
#            https://gist.github.com/bearice/331a954d86d890d9dbeacdd7de3aabe8
#            https://lala.im/7911.html
#            https://github.com/office-itou/Linux/blob/master/installer/source/preseed_debian.cfg
#            https://qiita.com/YasuhiroABE/items/ff233459035d8187263d
#
    elif [[ "$4" == 'centos' ]] || [[ "$4" == 'rockylinux' ]] || [[ "$4" == 'almalinux' ]] || [[ "$4" == 'fedora' ]]; then
      tmpKsAllDisks=$(echo "$3" | sed 's/\/dev\///g')
      ksRaidVolumes=()
      ksRaidConfigs=""
      ksRaidRecipes=""
      if [[ "$EfiSupport" == "enabled" ]]; then
        for (( partitionIndex=0; partitionIndex<="2"; partitionIndex++ )); do
          disksIndex="1"
          for currentDisk in $tmpKsAllDisks; do
            tmpKsRaidVolumes="raid."$partitionIndex""$disksIndex""
            if [[ "$partitionIndex" == "0" ]]; then
              tmpKsRaidConfigs="part "$tmpKsRaidVolumes" --size="512" --ondisk="$currentDisk""
            elif [[ "$partitionIndex" == "1" ]]; then
              tmpKsRaidConfigs="part "$tmpKsRaidVolumes" --size="1024" --ondisk="$currentDisk""
            elif [[ "$partitionIndex" == "2" ]]; then
              tmpKsRaidConfigs="part "$tmpKsRaidVolumes" --size="0" --grow --ondisk="$currentDisk""
            fi
            disksIndex=$(expr "$disksIndex" + 1)
            ksRaidVolumes[$partitionIndex]+=""$tmpKsRaidVolumes" "
            ksRaidConfigs+=""$tmpKsRaidConfigs"\n"
          done
        done
        ksRaidConfigs=$(echo -e "$ksRaidConfigs")
        ksRaidRecipes=`echo -e "raid /boot --fstype="xfs" --device="boot" --level="1" ${ksRaidVolumes[0]}
raid /boot/efi --fstype="efi" --device="boot-efi" --level="1" ${ksRaidVolumes[1]}
raid / --fstype="xfs" --device="root" --level="$1" ${ksRaidVolumes[2]}
"`
      else
        for (( partitionIndex=0; partitionIndex<="2"; partitionIndex++ )); do
          disksIndex="1"
          for currentDisk in $tmpKsAllDisks; do
            tmpKsRaidVolumes="raid."$partitionIndex""$disksIndex""
            if [[ "$partitionIndex" == "0" ]]; then
              tmpKsRaidConfigs="part biosboot --fstype="biosboot" --size="1" --ondisk="$currentDisk""
            elif [[ "$partitionIndex" == "1" ]]; then
              tmpKsRaidConfigs="part "$tmpKsRaidVolumes" --size="1024" --ondisk="$currentDisk""
            elif [[ "$partitionIndex" == "2" ]]; then
              tmpKsRaidConfigs="part "$tmpKsRaidVolumes" --size="0" --grow --ondisk="$currentDisk""
            fi
            disksIndex=$(expr "$disksIndex" + 1)
            ksRaidVolumes[$partitionIndex]+=""$tmpKsRaidVolumes" "
            ksRaidConfigs+=""$tmpKsRaidConfigs"\n"
          done
        done
        ksRaidConfigs=$(echo -e "$ksRaidConfigs")
        ksRaidRecipes=`echo -e "raid /boot --fstype="xfs" --device="boot" --level="1" ${ksRaidVolumes[1]}
raid / --fstype="xfs" --device="root" --level="$1" ${ksRaidVolumes[2]}
"`
      fi
      FormatDisk="${ksRaidConfigs}
${ksRaidRecipes}"
# Reference: <Example 27.4. Using the raid Kickstart command>. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/installation_guide/sect-kickstart-syntax
#            https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/installation_guide/sect-kickstart-examples
#            https://gist.github.com/micmoyles/587131aa19089e5c18916949c26b65e7
#            <4.3.3.1. ソフトウェアRAID1でのシステムパーティションの作成>. https://dl.acronis.com/u/software-defined/html/AcronisCyberInfrastructure_3_5_installation_guide_ja-JP/installing-using-pxe/creating-kickstart-file.html#kickstart-file-example
    else
      echo -ne "\n[${red}Warning${plain}] Raid $1 recipe is not supported by target system!\n"
      exit 1
    fi
  }
}

# $1 is timezone checkfile direction, $2 $3 $4 $5 and $6/$7/$8 are different IP geography location data providers to avoid if any of them has a downtime.
function getUserTimeZone() {
  if [[ ! "$TimeZone" =~ ^[a-zA-Z] ]]; then
    loginUser=`who am i | awk '{print $1}' | sed 's/(//g' | sed 's/)//g'`
    [[ -z "$loginUser" ]] && loginUser="root"
# "azureuser" can't be shown compeletely in output of "netstat" and it's the default username in official template of Azure.
    [[ "${#loginUser}" -ge "7" ]] && loginUser=`echo ${loginUser:0:7}`
# Alpine Linux doesn't support "who am i".
# In some situations, there are several users with different IPs to connect to server by ssh service,
# So we need to filter a list of "Send-Q" and IPs from netstat and sort from largest to smallest by "Sent-Q" to ensure which IP is the current user,
# because the "Sent-Q" can record the data packs which IP is active for current ssh user.
# The same as for IPv6s.
    GuestIP=`netstat -naputeoW | grep -i 'established' | grep -i 'sshd: '$loginUser'' | grep -iw '^tcp\|udp' | awk '{print $3,$5}' | sort -t ' ' -k 1 -rn | awk '{print $2}' | head -n 1 | cut -d':' -f'1'`
    if [[ ! -z "$GuestIP" ]]; then
      checkIfIpv4AndIpv6IsLocalOrPublic "$GuestIP" ""
# If some users are connecting to ssh service via private IPs, the actual location of this server may be the same as the public IP of this server like:
# I created a virtual machine by VMware on my laptop and access it with as "192.168.0.217", to determine timezone of current user according to this IP is meaningless.
      [[ "$ipv4LocalOrPublicStatus" == '1' ]] && {
        GuestIP=`timeout 0.3s dig -4 TXT +short o-o.myaddr.l.google.com @ns1.google.com | sed 's/\"//g'`
        [[ "$GuestIP" == "" ]] && GuestIP=`timeout 0.3s dig -4 TXT CH +short whoami.cloudflare @1.1.1.1 | sed 's/\"//g'`
      }
    else
      GuestIP=`netstat -naputeoW | grep -i 'established' | grep -i 'sshd: '$loginUser'' | grep -iw '^tcp6\|udp6' | awk '{print $3,$5}' | sort -t ' ' -k 1 -rn | awk '{print $2}' | head -n 1 | awk -F':' '{for (i=1;i<=NF-1;i++)printf("%s:", $i);print ""}' | sed 's/.$//'`
      checkIfIpv4AndIpv6IsLocalOrPublic "" "$GuestIP"
      [[ "$ipv6LocalOrPublicStatus" == '1' ]] && {
        GuestIP=`timeout 0.3s dig -6 TXT +short o-o.myaddr.l.google.com @ns1.google.com | sed 's/\"//g'`
        [[ "$GuestIP" == "" ]] && GuestIP=`timeout 0.3s dig -6 TXT CH +short whoami.cloudflare @2606:4700:4700::1111 | sed 's/\"//g'`
      }
    fi
    for Count in "$2$GuestIP" "$3$GuestIP" "$4$GuestIP" "$5$GuestIP/json/" "$6" "$7" "$8"; do
      [[ "$TimeZone" == "Asia/Shanghai" ]] && break
      if [[ "$Count" =~ ^[a-zA-Z0-9]+$ ]]; then
        tmpApi=`echo -n "$Count" | base64 -d`
        Count="https://api.ipgeolocation.io/timezone?apiKey=$tmpApi&ip=$GuestIP"
      fi
      TimeZone=`curl -s "$Count" -A firefox | jq '.timezone, .time_zone' | grep -v "null" | tr -d '"'`
      checkTz=`echo $TimeZone | cut -d'/' -f 1`
      [[ -n "$checkTz" && "$checkTz" =~ ^[a-zA-Z] ]] && break
    done
    [[ -z "$TimeZone" ]] && TimeZone="Asia/Tokyo"
  else
    echo `timedatectl list-timezones` >> "$1"
    [[ `grep -c "$TimeZone" "$1"` == "0" || ! "/usr/share/zoneinfo/$1" ]] && TimeZone="Asia/Tokyo"
    rm -rf "$1"
  fi
}

function checkEfi() {
  EfiStatus=`efibootmgr l`
  EfiVars=""
  for Count in "$1" "$2" "$3" "$4"; do
    EfiVars=`ls -Sa $Count | wc -l`
    [[ "$EfiVars" -ge "1" ]] && break
  done
  if [[ "$EfiStatus" == "" ]] || [[ "$EfiVars" == "0" ]]; then
    EfiSupport="disabled"
  elif [[ -n `echo "$EfiStatus" | grep -i "bootcurrent" | awk '{print $2}' | sed -n '/^[[:xdigit:]]*$/p' | head -n 1` || -n `echo "$EfiStatus" | grep -i "bootorder" | awk '{print $2}' | awk -F ',' '{print $NF}' | sed -n '/^[[:xdigit:]]*$/p' | head -n 1` ]] && [[ "$EfiVars" != "0" ]]; then
    EfiSupport="enabled"
  else
    echo -ne "\n[${red}Error${plain}] UEFI boot firmware of your system could not be confirmed!\n"
    exit 1
  fi
}

# $1 is "/boot/grub/", $2 is "/boot/grub2/", $3 is "/etc/", $4 is "grub.cfg", $5 is "grub.conf", $6 is "/boot/efi/EFI/"
# In some templates of Redhat series 7-8, UEFI firmware from Hetzner and etc. , there are two directions of grub configure files like:
#
# /boot/efi/EFI/rocky/grub.cfg
# /boot/grub2/grub.cfg
#
# The contents of the above two files are almost equal, but the new boot menuentry which we need to write in file "/etc/grub.d/40_custom"
# can only valid after reboot by using "grub2-mkconfig -o /boot/efi/EFI/rocky/grub.cfg", "grub2-mkconfig -o /boot/grub2/grub.cfg" doesn't cause any effect,
# So in this situation, to find out the valid grub config file like "/boot/efi/EFI/rocky/grub.cfg" at first is necessary.
# For Redhat series 9 and later, including Fedora 36+, the valid direction of grub config files are unified back to "/boot/grub2/grub.cfg" now,
# so we won't have to consider the troubles which were caused by Redhat 7-8 series's abnormal settings.
function checkGrub() {
  GRUBDIR=""
  GRUBFILE=""
  for Count in "$4" "$5"; do
    GRUBFILE=`find "$6" -name "$Count"`
    if [[ -n "$GRUBFILE" ]]; then
      GRUBDIR=`echo "$GRUBFILE" | sed "s/$Count//g"`
      GRUBFILE="$Count"
      break
    fi
  done
  GRUBDIR=`echo $GRUBDIR | awk '{print $1}'`
  if [[ -z "$GRUBFILE" ]] || [[ `grep -c "insmod*" $GRUBDIR$GRUBFILE` == "0" ]]; then
    for Count in "$1" "$2" "$3"; do
# Don't support grub1 of CentOS/Redhat Enterprise Linux/Oracle Linux 6.x
      if [[ -f "$Count""$4" ]] && [[ `grep -c "insmod*" $Count$4` -ge "1" ]]; then
        GRUBDIR="$Count"
        GRUBFILE="$4"
      elif [[ -f "$Count""$5" ]] && [[ `grep -c "insmod*" $Count$5` -ge "1" ]]; then
        GRUBDIR="$Count"
        GRUBFILE="$5"
      fi
    done
  fi
  GRUBDIR=`echo ${GRUBDIR%?}`
  if [[ `awk '/menuentry*/{print NF}' $GRUBDIR/$GRUBFILE | head -n 1` -ge "1" ]] || [[ `awk '/feature*/{print $a}' $GRUBDIR/$GRUBFILE | head -n 1` != "" ]]; then
    if [[ -n `grep -w "grub2-mkconfig" $GRUBDIR/$GRUBFILE` ]] || [[ `type grub2-mkconfig` != "" ]]; then
      GRUBTYPE="isGrub2"
    elif [[ -n `grep -w "grub-mkconfig" $GRUBDIR/$GRUBFILE` ]] || [[ `type grub-mkconfig` != "" ]]; then
      GRUBTYPE="isGrub1"
    elif [[ "$CurrentOS" == "CentOS" || "$CurrentOS" == "OracleLinux" ]] && [[ "$CurrentOSVer" -le "6" ]]; then
      GRUBTYPE="isGrub1"
    fi
  fi
}

# $1 is $linux_relese, $2 is $RedHatSeries, $3 is $targetRelese
function checkMem() {
  TotalMem1=$(cat /proc/meminfo | grep "^MemTotal:" | sed 's/kb//i' | grep -o "[0-9]*" | awk -F' ' '{print $NF}')
  TotalMem2=$(free -k | grep -wi "mem*" | awk '{printf $2}')
# In any servers that total memory below 2.5GB to install debian, the low memory installation will be force enabled, "lowmem=+0, 1 or 2" is only for Debian like, 0 is lowest, 1 is medium, 2 is the highest.
  [[ "$1" == 'debian' ]] || [[ "$1" == 'ubuntu' ]] || [[ "$1" == 'kali' ]] && {
    [[ "$TotalMem1" -ge "2558072" || "$TotalMem2" -ge "2558072" ]] && lowmemLevel="" || lowmemLevel="lowmem=+1"
    [[ "$setMemCheck" == '1' ]] && {
      [[ "$TotalMem1" -le "329760" || "$TotalMem2" -le "329760" ]] && {
        echo -ne "\n[${red}Error${plain}] Minimum system memory requirement is 384MB!\n"
        exit 1
      }
    }
  }
# Without the function of OS re-installation templates in control panel which provided by cloud companies(many companies even have not).
# A independent VPS with only one hard drive is lack of the secondary hard drive to format and copy new OS file to main hard drive.
# So PXE installation need to use memory as a 'hard drive' temporary.
# For redhat series, the main OS installation file is 'squashfs.img', for example, this is the link of rockylinux 8 LiveOS iso file:
# http://dl.rockylinux.org/pub/rocky/8/Live/x86_64/Rocky-8-MATE-x86_64-latest.iso
# If you download and mount it, you will found that the size of '/LiveOS/squashfs.img' is 1.55GB!
# It means in first step of netboot installation, this 1.55GB file will be all downloaded and loaded in memory!
# So and consider other install programs if necessary, even 2GB memory is not enough, 2.5GB only just pass, it's so ridiculous!
# Debian 11 PXE installation will be able in low memory mode just 512M, why redhat loves swallow memory so much, is shame on you!
# Redhat 9 slightly improved the huge occupy of the memory, 2GB RAM machine can run it successfully, but CentOS 9-stream needs 2.5GB RAM more.
# Technology companies usually add useless functions and redundant code in new version of software increasingly.
# They never optimize or improve it, just tell users they need to pay more to expand their hardware performance and adjust to the endless demand of them. it's not a correct decision. 
  [[ "$setMemCheck" == '1' ]] && {
    [[ "$1" == 'fedora' || "$1" == 'rockylinux' || "$1" == 'almalinux' || "$1" == 'centos' ]] && {
      if [[ "$1" == 'rockylinux' || "$1" == 'almalinux' || "$1" == 'centos' ]]; then
        if [[ "$2" == "8" ]] || [[ "$1" == 'centos' && "$2" -ge "9" ]]; then
          [[ "$TotalMem1" -le "2198342" || "$TotalMem2" -le "2198342" ]] && {
            echo -ne "\n[${red}Error${plain}] Minimum system memory requirement is 2.5GB!\n"
            exit 1
          }
        elif [[ "$2" -ge "9" ]]; then
          [[ "$TotalMem1" -le "1740800" || "$TotalMem2" -le "1740800" ]] && {
            echo -ne "\n[${red}Error${plain}] Minimum system memory requirement is 2GB!\n"
            exit 1
          }
        elif [[ "$2" == "7" ]]; then
          [[ "$TotalMem1" -le "1319006" || "$TotalMem2" -le "1319006" ]] && {
            echo -ne "\n[${red}Error${plain}] Minimum system memory requirement is 1.5GB!\n"
            exit 1
          }
        fi
      elif [[ "$1" == 'fedora' ]]; then
        [[ "$TotalMem1" -le "1740800" || "$TotalMem2" -le "1740800" ]] && {
          echo -ne "\n[${red}Error${plain}] Minimum system memory requirement is 2GB!\n"
          exit 1
        }
      fi
    }
    [[ "$1" == 'alpinelinux' || "$3" == 'Ubuntu' ]] && {
      if [[ "$3" == 'Ubuntu' ]]; then
        [[ "$TotalMem1" -le "447664" || "$TotalMem2" -le "447664" ]] && {
          echo -ne "\n[${red}Error${plain}] Minimum system memory requirement is 0.5GB!\n"
          exit 1
        }
      elif [[ "$1" == 'alpinelinux' ]]; then
        [[ "$TotalMem1" -le "895328" || "$TotalMem2" -le "895328" ]] && {
          echo -ne "\n[${red}Error${plain}] Minimum system memory requirement is 1GB!\n"
          exit 1
        }
      fi
    }
    if [[ "$TotalMem1" -le "1740800" || "$TotalMem2" -le "1740800" ]]; then
      setFail2banStatus="0"
      [[ "$setFail2ban" == "1" ]] && setFail2banStatus="1"
    else
      [[ "$setFail2ban" == "0" ]] && setFail2banStatus="0" || setFail2banStatus="1"
    fi
    [[ "$linux_relese" == 'debian' && "$DebianDistNum" -le "8" ]] && setFail2banStatus="0"
  }
}

function checkVirt() {
  virtType=""
  for Count in $(dmidecode -s system-manufacturer | awk '{print $1}' | sed 's/[A-Z]/\l&/g') $(systemd-detect-virt | sed 's/[A-Z]/\l&/g') $(lscpu | grep -i "hypervisor vendor" | cut -d ':' -f 2 | sed 's/^[ \t]*//g' | sed 's/[A-Z]/\l&/g'); do
    virtType+="$Count"
  done
  virtWhat=$(virt-what)
}

function checkSys() {
# Fix debian security sources 404 not found (only of default sources) 
  sed -i 's/^\(deb.*security.debian.org\/\)\(.*\)\/updates/\1debian-security\2-security/g' /etc/apt/sources.list
  
  CurrentOSVer=`cat /etc/os-release | grep -w "VERSION_ID=*" | awk -F '=' '{print $2}' | sed 's/\"//g' | cut -d'.' -f 1`

  apt update -y
# Try to fix error of connecting to current mirror for Debian.
  if [[ $? -ne 0 ]]; then
    apt update -y > /root/apt_execute.log
    if [[ `grep -i "debian" /root/apt_execute.log` ]] && [[ `grep -i "err:[0-9]" /root/apt_execute.log` || `grep -i "404  not found" /root/apt_execute.log` ]]; then
      currentDebianMirror=$(sed -n '/^deb /'p /etc/apt/sources.list | head -n 1 | awk '{print $2}' | sed -e 's|^[^/]*//||' -e 's|/.*$||')
      if [[ "$CurrentOSVer" -gt "9" ]]; then
# Replace invalid mirror of Debian to 'deb.debian.org' if current version has not been 'EOL'(End Of Life).
        sed -ri "s/$currentDebianMirror/deb.debian.org/g" /etc/apt/sources.list
      else
# Replace invalid mirror of Debian to 'archive.debian.org' because it had been marked with 'EOL'.
        sed -ri "s/$currentDebianMirror/archive.debian.org/g" /etc/apt/sources.list
      fi
# Disable get security update.
      sed -ri 's/^deb-src/# deb-src/g' /etc/apt/sources.list
      apt update -y
    fi
    rm -rf /root/apt_execute.log
  fi
  apt install lsb-release -y

# Delete mirrors from elrepo.org because it will causes dnf/yum checking updates continuously(maybe some of the server mirror lists are in the downtime?)
  [[ `grep -wri "elrepo.org" /etc/yum.repos.d/` != "" ]] && {
    elrepoFile=`grep -wri "elrepo.org" /etc/yum.repos.d/ | head -n 1 | cut -d':' -f 1`
    mv "$elrepoFile" "$elrepoFile.bak"
  }
  yum install redhat-lsb -y
  OsLsb=`lsb_release -d | awk '{print$2}'`
  
  RedHatRelease=""
  for Count in `cat /etc/redhat-release | awk '{print$1}'` `cat /etc/system-release | awk '{print$1}'` `cat /etc/os-release | grep -w "ID=*" | awk -F '=' '{print $2}' | sed 's/\"//g'` "$OsLsb"; do
    [[ -n "$Count" ]] && RedHatRelease=`echo -e "$Count"`"$RedHatRelease"
  done
  
  DebianRelease=""
  IsUbuntu=`uname -a | grep -i "ubuntu"`
  IsDebian=`uname -a | grep -i "debian"`
  IsKali=`uname -a | grep -i "kali"`
  for Count in `cat /etc/os-release | grep -w "ID=*" | awk -F '=' '{print $2}'` `cat /etc/issue | awk '{print $1}'` "$OsLsb"; do
    [[ -n "$Count" ]] && DebianRelease=`echo -e "$Count"`"$DebianRelease"
  done
  
  AlpineRelease=""
  apk update
  for Count in `cat /etc/os-release | grep -w "ID=*" | awk -F '=' '{print $2}'` `cat /etc/issue | awk '{print $3}' | head -n 1` `uname -v | awk '{print $1}' | sed 's/[^a-zA-Z]//g'`; do
    [[ -n "$Count" ]] && AlpineRelease=`echo -e "$Count"`"$AlpineRelease"
  done
  
  if [[ `echo "$RedHatRelease" | grep -i 'centos'` != "" ]]; then
    CurrentOS="CentOS"
  elif [[ `echo "$RedHatRelease" | grep -i 'cloudlinux'` != "" ]]; then
    CurrentOS="CloudLinux"
  elif [[ `echo "$RedHatRelease" | grep -i 'alma'` != "" ]]; then
    CurrentOS="AlmaLinux"
  elif [[ `echo "$RedHatRelease" | grep -i 'rocky'` != "" ]]; then
    CurrentOS="RockyLinux"
  elif [[ `echo "$RedHatRelease" | grep -i 'fedora'` != "" ]]; then
    CurrentOS="Fedora"
  elif [[ `echo "$RedHatRelease" | grep -i 'virtuozzo'` != "" ]]; then
    CurrentOS="Vzlinux"
  elif [[ `echo "$RedHatRelease" | grep -i 'ol\|oracle'` != "" ]]; then
    CurrentOS="OracleLinux"
  elif [[ `echo "$RedHatRelease" | grep -i 'opencloud'` != "" ]]; then
    CurrentOS="OpenCloudOS"
  elif [[ `echo "$RedHatRelease" | grep -i 'alibaba\|alinux\|aliyun'` != "" ]]; then
    CurrentOS="AlibabaCloudLinux"
  elif [[ `echo "$RedHatRelease" | grep -i 'amazon\|amzn'` != "" ]]; then
    CurrentOS="AmazonLinux"
    amazon-linux-extras install epel -y
  elif [[ `echo "$RedHatRelease" | grep -i 'red\|rhel'` != "" ]]; then
    CurrentOS="RedHatEnterpriseLinux"
  elif [[ `echo "$RedHatRelease" | grep -i 'anolis'` != "" ]]; then
    CurrentOS="OpenAnolis"
  elif [[ `echo "$RedHatRelease" | grep -i 'scientific'` != "" ]]; then
    CurrentOS="ScientificLinux"
  elif [[ `echo "$AlpineRelease" | grep -i 'alpine'` != "" ]]; then
    CurrentOS="AlpineLinux"
  elif [[ "$IsUbuntu" ]] || [[ `echo "$DebianRelease" | grep -i 'ubuntu'` != "" ]]; then
    CurrentOS="Ubuntu"
    CurrentOSVer=`lsb_release -r | awk '{print$2}' | cut -d'.' -f1`
  elif [[ "$IsDebian" ]] || [[ `echo "$DebianRelease" | grep -i 'debian'` != "" ]]; then
    CurrentOS="Debian"
    CurrentOSVer=`lsb_release -r | awk '{print$2}' | cut -d'.' -f1`
  elif [[ "$IsKali" ]] || [[ `echo "$DebianRelease" | grep -i 'kali'` != "" ]]; then
    CurrentOS="Kali"
    CurrentOSVer=`lsb_release -r | awk '{print$2}' | cut -d'.' -f1`
  else
    echo -ne "\n[${red}Error${plain}] Does't support your system!\n"
    exit 1
  fi
# Don't support Redhat like linux OS under 6 version.
  if [[ "$CurrentOS" == "CentOS" || "$CurrentOS" == "OracleLinux" ]] && [[ "$CurrentOSVer" -le "6" ]]; then
    echo -e "Does't support your system!\n"
    exit 1
  fi

# Remove "inetutils-ping" because it does not support the statement of "ping -4" or "ping -6".
# "kexec-tools" is also need to be removed because in environment of official template of Debian 12 on Tencent Cloud, whether it is executing on instance of "Lighthouse" or "CVM"(Cloud Virtual Machine).
# This component may cause the menuentry of grub which we had generated and wrote can't be booted successfully when rebooting the system.
  apt purge inetutils-ping kexec-tools -y
# Debian like linux OS necessary components.
  apt install cpio curl dnsutils efibootmgr fdisk file gzip iputils-ping jq net-tools openssl subnetcalc tuned virt-what wget xz-utils -y

# Redhat like Linux OS prefer to use dnf instead of yum because former has a higher execute efficiency.
  yum install epel-release -y
  yum install dnf -y
  if [[ $? -eq 0 ]]; then
# To avoid "Failed loading plugin "osmsplugin": No module named 'librepo'"
# Reference: https://anatolinicolae.com/failed-loading-plugin-osmsplugin-no-module-named-librepo/
    [[ "$CurrentOS" == "CentOS" && "$CurrentOSVer" == "8" ]] && dnf install python3-librepo -y
# Redhat like linux OS necessary components.
    dnf install bind-utils cpio curl dnsutils efibootmgr file gzip ipcalc jq net-tools openssl redhat-lsb syslinux tuned util-linux virt-what wget xz --skip-broken -y
    # dnf update -y
  else
    yum install dnf -y > /root/yum_execute.log 2>&1
# In some versions of CentOS 8 which are not subsumed into CentOS-stream are end of supporting by CentOS official, so the source is failure.
# We need to change the source from http://mirror.centos.org to http://vault.centos.org to make repository is still available.
# Reference: https://techglimpse.com/solve-failed-synchronize-cache-repo-appstream/
#            https://qiita.com/yamada-hakase/items/cb1b6124e11ca65e2a2b
    if [[ `grep -i "failed to synchronize" /root/yum_execute.log` || `grep -i "no urls in mirrorlist" /root/yum_execute.log` ]]; then
      if [[ "$CurrentOS" == "CentOS" ]]; then
        cd /etc/yum.repos.d/
        sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
        sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
        [[ "$CurrentOSVer" == "8" ]] && dnf install python3-librepo -y
      fi
      yum install epel-release -y
      yum install dnf -y
# Run dnf update and install components.
# In official template of AlmaLinux 9 of Linode, "tuned" must be installed otherwise "grub2-mkconfig" can't work formally.
# Reference: https://phanes.silogroup.org/fips-disa-stig-hardening-on-centos9/
      dnf install bind-utils cpio curl dnsutils efibootmgr file gzip ipcalc jq net-tools openssl redhat-lsb syslinux tuned util-linux virt-what wget xz --skip-broken -y
      # dnf update -y
# Oracle Linux 7 doesn't support DNF.
    elif [[ `grep -i "no package" /root/yum_execute.log` ]]; then
      yum install bind-utils cpio curl dnsutils efibootmgr file gzip ipcalc jq net-tools openssl redhat-lsb syslinux tuned util-linux virt-what wget xz --skip-broken -y
      # yum update -y
    fi
    rm -rf /root/yum_execute.log
  fi

# Alpine Linux necessary components and configurations.
  [[ "$CurrentOS" == "AlpineLinux" ]] && {
# Get current version number of Alpine Linux
    CurrentAlpineVer=$(cut -d. -f1,2 </etc/alpine-release)
# Try to remove comments of any valid mirror.
    sed -i 's/#//' /etc/apk/repositories
# Add community mirror.
    [[ ! `grep -i "community" /etc/apk/repositories` ]] && sed -i '$a\http://ftp.udx.icscoe.jp/Linux/alpine/v'${CurrentAlpineVer}'/community' /etc/apk/repositories
# Add testing mirror.
    # [[ ! `grep -i "testing" /etc/apk/repositories` ]] && sed -i '$a\http://ftp.udx.icscoe.jp/Linux/alpine/edge/testing' /etc/apk/repositories
# Alpine Linux use "apk" as package management.
    apk update
    apk add bash bind-tools coreutils cpio curl efibootmgr file gawk grep gzip ipcalc jq lsblk net-tools openssl sed shadow tzdata util-linux virt-what wget xz
# Use bash to replace ash.
    sed -i 's/root:\/bin\/ash/root:\/bin\/bash/g' /etc/passwd
  }
}

# $1 is "$ipAddr", $2 is "$ip6Addr"
function checkIpv4OrIpv6() {
  for ((w=1; w<=2; w++)); do
    IPv4DNSLookup=`timeout 0.3s dig -4 TXT +short o-o.myaddr.l.google.com @ns1.google.com | sed 's/\"//g'`
    [[ "$IPv4DNSLookup" == "" ]] && IPv4DNSLookup=`timeout 0.3s dig -4 TXT CH +short whoami.cloudflare @1.1.1.1 | sed 's/\"//g'`
    [[ "$IPv4DNSLookup" != "" ]] && break
  done
  for ((x=1; x<=2; x++)); do
    IPv6DNSLookup=`timeout 0.3s dig -6 TXT +short o-o.myaddr.l.google.com @ns1.google.com | sed 's/\"//g'`
    [[ "$IPv6DNSLookup" == "" ]] && IPv6DNSLookup=`timeout 0.3s dig -6 TXT CH +short whoami.cloudflare @2606:4700:4700::1111 | sed 's/\"//g'`
    [[ "$IPv6DNSLookup" != "" ]] && break
  done
  for y in "$3" "$4" "$5" "$6"; do
    IPv4PingDNS=`timeout 0.3s ping -4 -c 1 "$y" | grep "rtt\|round-trip" | cut -d'/' -f5 | awk -F'.' '{print $NF}' | sed -E '/^[0-9]\+\(\.[0-9]\+\)\?$/p'`"$IPv4PingDNS"
    [[ "$IPv4PingDNS" != "" ]] && break
  done
  for z in "$7" "$8" "$9" "$10"; do
    IPv6PingDNS=`timeout 0.3s ping -6 -c 1 "$z" | grep "rtt\|round-trip" | cut -d'/' -f5 | awk -F'.' '{print $NF}' | sed -E '/^[0-9]\+\(\.[0-9]\+\)\?$/p'`"$IPv6PingDNS"
    [[ "$IPv6PingDNS" != "" ]] && break
  done

# Use ping -4/-6 to replace dig -4/-6 because some IPv4 network will callback IPv6 address from DNS even if we use "dig -4" to get DNS result.
  [[ "$IPv4PingDNS" =~ ^[0-9] && "$IPv6PingDNS" =~ ^[0-9] ]] && IPStackType="BiStack"
  [[ "$IPv4PingDNS" =~ ^[0-9] && ! "$IPv6PingDNS" =~ ^[0-9] ]] && IPStackType="IPv4Stack"
  [[ ! "$IPv4PingDNS" =~ ^[0-9] && "$IPv6PingDNS" =~ ^[0-9] ]] && IPStackType="IPv6Stack"
  [[ -n "$1" || -n "$2" ]] && {
    if [[ -n "$1" && -z "$2" ]]; then
      for ipCheck in "$1" "$ipGate"; do
        verifyIPv4FormatLawfulness "$ipCheck"
      done
    elif [[ -n "$1" && -n "$2" ]]; then
      for ipCheck in "$1" "$ipGate"; do
        verifyIPv4FormatLawfulness "$ipCheck"
      done
      for ipCheck in "$2" "$ip6Gate"; do
        verifyIPv6FormatLawfulness "$ipCheck"
      done
      IPStackType="BiStack"
    elif [[ -z "$1" && -n "$2" ]]; then
      for ipCheck in "$2" "$ip6Gate"; do
        verifyIPv6FormatLawfulness "$ipCheck"
      done
    fi
  }
  
  [[ $(echo "$setIpStack" | grep -i "bi\|bistack\|dual\|two") ]] && IPStackType="BiStack"
  [[ $(echo "$setIpStack" | grep -i "4\|i4\|ip4\|ipv4") ]] && IPStackType="IPv4Stack"
  [[ $(echo "$setIpStack" | grep -i "6\|i6\|ip6\|ipv6") ]] && IPStackType="IPv6Stack"
  
  # [[ "$IPStackType" == "IPv4Stack" ]] && setIPv6="0" || setIPv6="1"
  [[ "$tmpSetIPv6" == "0" ]] && setIPv6="0" || setIPv6="1"
}

function verifyIPv4FormatLawfulness() {
  [[ -n "$1" ]] && IP_Check="$1"
  if expr "$IP_Check" : '[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$' >/dev/null; then
    for i in 1 2 3 4; do
      if [ $(echo "$IP_Check" | cut -d. -f$i) -gt 255 ]; then
        echo "fail ($IP_Check)"
        exit 1
      fi
    done
    IP_Check="isIPv4"
  fi
  [[ "$IP_Check" != "isIPv4" ]] && {
    echo -ne "\n[${red}Error${plain}] Invalid inputted IPv4 format!\n"
    exit 1
  }
}

function verifyIPv6FormatLawfulness() {
  [[ -n "$1" ]] && IPv6_Check="$1"
# If the last two strings of IPv6 is "::", we should replace ":" to "0" for the last string to make sure it's a valid IPv6(can't end with ":").
  [[ "${IPv6_Check: -1}" == ":" ]] && IPv6_Check=$(echo "$IPv6_Check" | sed 's/.$/0/')
# If the first two strings of IPv6 is "::", we should replace ":" to "0" for the first string to make sure it's a valid IPv6(can't start with ":").
  [[ "${IPv6_Check:0:1}" == ":" ]] && IPv6_Check=$(echo "$IPv6_Check" | sed 's/^./0/')
# Add ":" in the last of the IPv6 address for cut all items infront of the ":" by split by symbol ":".
  IP6_Check_Temp="$IPv6_Check"":"
# Total numbers of the hex blocks in IPv6 address includes with empty value(abbreviation of "0000").
  IP6_Hex_Num=`echo "$IP6_Check_Temp" | tr -cd ":" | wc -c`
# Default number of empty values of the hex block is "0".
  IP6_Hex_Abbr="0"
# The first filter plays a role of:
# 1. check if 0-9 or a-z and ":" in original IPv6;
# 2. the longest number of ":" in IPv6 is "7", because of variable "IP6_Check_Temp" one more ":" has been add,
# so the total number of ":" in variable "IP6_Check_Temp" should be less or equal "8".
  if [[ `echo "$IPv6_Check" | grep -i '[[:xdigit:]]' | grep ':'` ]] && [[ "$IP6_Hex_Num" -le "8" ]]; then
# IPv6 address doesn't allow two "::" existed, the number of ":" should not above 7.
# If number of ":" is less than 6, at least one "::" is required.
# IPv6 can't end with "hex_number:"
    [[ `echo "$1" | grep -o ":::" | wc -l` -gt "0" ]] || [[ `echo "$1" | grep -o "::" | wc -l` -gt "1" || `echo "$1" | grep -o ":" | wc -l` -gt "7" ]] || [[ "$IP6_Hex_Num" -le "7" && `echo "$1" | grep -o "::" | wc -l` -lt "1" ]] || [[ "${1: -2}" != "::" && "${1: -1}" == ":" ]] && { echo -ne "\n[${red}Error${plain}] Invalid inputted IPv6 format!\n"; exit 1; }
# Total cycles of the check(sequence of the current hex block).
    for ((i=1; i<="$IP6_Hex_Num"; i++)); do
# Every IPv6 hex block of current cycle.
      IP6_Hex=$(echo "$IP6_Check_Temp" | cut -d: -f$i)
# Count "::" abbreviations for this IPv6.
      [[ "$IP6_Hex" == "" ]] && IP6_Hex_Abbr=`expr $IP6_Hex_Abbr + 1`
# String number of letters or numbers in one block should less or equal "4".
      if [[ `echo "$IP6_Hex" | wc -m` -le "5" ]]; then
# The second filter plays a reversion role of the following to exclude an effective IPv6 hex block:
# 1. Except 0-9 and a-f;
# 2. Abbreviation of hex block should be appeared less than or equal one time in principle.
        [[ `echo "$IP6_Hex" | grep -iE '[^0-9a-f]'` || "$IP6_Hex_Abbr" -gt "1" ]] && { echo -ne "\n[${red}Error${plain}] Invalid inputted IPv6 format!\n"; exit 1; }
      else
        echo -ne "\n[${red}Error${plain}] Invalid inputted IPv6 format!\n"; exit 1;
      fi
    done
    IP6_Check="isIPv6"
  fi
  [[ "$IP6_Check" != "isIPv6" ]] && { echo -ne "\n[${red}Error${plain}] Invalid inputted IPv6 format!\n"; exit 1; }
}

# $1 is for IPv4s, $2 is for IPv6s, '1' is private to each stack.
function checkIfIpv4AndIpv6IsLocalOrPublic() {
  ipv4LocalOrPublicStatus=''; ipv6LocalOrPublicStatus=''; ip4CertFirst=''; ip4CertSecond=''; ip4CertThird=''; ip6CertAddrWhole=''; ip6CertAddrFirst='';
  [[ -n "$1" ]] && {
    ip4CertFirst=`echo $1 | cut -d'.' -f1`
    ip4CertSecond=`echo $1 | cut -d'.' -f2`
    ip4CertThird=`echo $1 | cut -d'.' -f3`
    [[ "$ip4CertFirst" == "169" && "$ip4CertSecond" == "254" ]] || [[ "$ip4CertFirst" == "172" && "$ip4CertSecond" -ge "16" && "$ip4CertSecond" -le "31" ]] || [[ "$ip4CertFirst" == "192" && "$ip4CertSecond" == "168" ]] || [[ "$ip4CertFirst" == "100" && "$ip4CertSecond" -ge "64" && "$ip4CertSecond" -le "127" ]] || [[ "$ip4CertFirst" == "10" && "$ip4CertSecond" -ge "0" && "$ip4CertSecond" -le "255" ]] || [[ "$ip4CertFirst" == "127" && "$ip4CertSecond" -ge "0" && "$ip4CertSecond" -le "255" ]] || [[ "$ip4CertFirst" == "198" && "$ip4CertSecond" -ge "18" && "$ip4CertSecond" -le "19" ]] || [[ "$ip4CertFirst" == "192" && "$ip4CertSecond" == "0" && "$ip4CertThird" == "0" || "$ip4CertThird" == "2" ]] || [[ "$ip4CertFirst" == "198" && "$ip4CertSecond" == "51" && "$ip4CertThird" == "100" ]] || [[ "$ip4CertFirst" == "203" && "$ip4CertSecond" == "0" && "$ip4CertThird" == "113" ]] && {
      ipv4LocalOrPublicStatus='1'
    }
  }
  [[ -n "$2" ]] && {
    ip6CertAddrWhole=`ultimateFormatOfIpv6 "$2"`
    ip6CertAddrFirst=`echo $ip6CertAddrWhole | sed 's/\(.\{4\}\).*/\1/' | sed 's/[a-z]/\u&/g'`
    [[ "$((16#$ip6CertAddrFirst))" -ge "$((16#FE80))" && "$((16#$ip6CertAddrFirst))" -le "$((16#FEBF))" ]] || [[ "$((16#$ip6CertAddrFirst))" -ge "$((16#FC00))" && "$((16#$ip6CertAddrFirst))" -le "$((16#FDFF))" ]] && {
      ipv6LocalOrPublicStatus='1'
    }
  }
}

# Some "BiStack" types are accomplished by Warp which provided by CloudFlare, so we need to distinguish whether IPv4 or IPv6 stack is enabled by Warp then exclude it.
# $1 is "warp*.conf", maybe "warp.conf" or "warp-profile.conf"; $2 is "wgcf*.conf", maybe "wgcf.conf" or "wgcf-profile.conf"; $3 is "wg[0-9]", maybe "wg0.conf" or etc.
# $4/$5/$6 are "warp*/wgcf*/wg[0-9]", $7/$8 are "PrivateKey/PublicKey".
function checkWarp() {
  warpConfFiles=$(find / -maxdepth 6 -name "$1" -print -or -name "$2" -print -or -name "$3" -print)
  sysctlWarpProcess=$(systemctl 2>&1 | grep -i "$4\|$5\|$6" | wc -l)
  rcWarpProcess=$(rc-status 2>&1 | grep -i "$4\|$5\|$6" | wc -l)
  [[ "$IPStackType" == "BiStack" ]] && {
    [[ -n "$warpConfFiles" ]] && {
      for warpConfFile in $(find / -maxdepth 6 -name "$1" -print -or -name "$2" -print -or -name "$3" -print); do
        if [[ $(grep -ic "$7" "$warpConfFile") -ge "1" || $(grep -ic "$8" "$warpConfFile") -ge "1" ]]; then
          warpStatic="1"
          break
        fi
      done
    }
    [[ "$sysctlWarpProcess" -gt "0" || "$rcWarpProcess" -gt "0" ]] && warpStatic="1"
  }
  [[ "$warpStatic" == "1" ]] && {
    [[ -z "$ipGate" ]] && IPStackType="IPv6Stack"
    [[ -z "$ip6Gate" ]] && IPStackType="IPv4Stack"
  }
}

# Examples:
# input:    ::
# output:   0:0:0:0:0:0:0:0
# input:    2620:119:35::c4
# output:   2620:119:35:0:0:0:0:c4
function fillAbbrOfIpv6() {
  inputIpv6="$1"
# Static of how many delimiters of ":" are in one ipv6 address, only one abbreviation of "::" is allowed in one IPv6 address in principle.
  delimiterNum=$(echo $inputIpv6 | awk '{print gsub(/:/, "")}')
  replaceStr=""
# A standard of IPv6 should have 7 colons, the number "7" minus total numbers of colons in an abbreviated IPv6 address and add "0" after every ":" can help us to fulfill the whole IPv6 address.
  for ((i=0; i<=$((7-$delimiterNum)); i++)); do
    replaceStr="$replaceStr"":0"
  done
# Must add one ":" after the last of expanded "0" to separate with the following IPv6 block which is not been abbreviated.
  replaceStr="$replaceStr"":"
# Replace abbreviated IPv6 address "::" to expanded IPv6 address($replaceStr).
  ipv6Expanded=${inputIpv6/::/$replaceStr}
# If the last two strings of abbreviated IPv6 is "::", we should add a "0" for the last ":" to pledge the validation of this IPv6(can't end with ":").
  [[ "$ipv6Expanded" == *: ]] && ipv6Expanded="$ipv6Expanded""0"
# If the first two strings of abbreviated IPv6 is "::", we should add a "0" for the first ":" to pledge the validation of this IPv6(can't begin with ":").
  [[ "$ipv6Expanded" == :* ]] && ipv6Expanded="0""$ipv6Expanded"
# Return IPv6 which is filled with one "0" in every abbreviated block.
  echo "$ipv6Expanded"
}

# Examples:
# input:    0:0:0:0:0:0:0:0
# output:   0000:0000:0000:0000:0000:0000:0000:0000
# input:    2620:119:35:0:0:0:0:c4
# output:   2620:0119:0035:0000:0000:0000:0000:00c4
function ultimateFormatOfIpv6() {
  abbrExpandedOfIpv6=$(fillAbbrOfIpv6 "$1")
# To make a new array names "$ipv6Hex" to storage every hex block like "2620" "119e" of IPv6, this array should have 8 indices.
  ipv6Hex=(${abbrExpandedOfIpv6//:/ })
  for ((j=0; j<8; j++)); do
# Static number of strings in every hex block of IPv6.
    length="${#ipv6Hex[j]}"
# Use decrement cycle to count how many zeroes need to be fulfilled because there are most 4 strings in one hex block in theory.
    for ((k=4; k>$length; k--)); do
# Zeroes which must be added on the head if number of digits of a hexadecimal number in one hex block is less than 4.
      ipv6Hex[j]="0${ipv6Hex[j]}"
    done
  done
# Return all elements of array of "$ipv6Hex" which is filled with 4 digits in every hexadecimal block and use colon to stitch with hexes instead of space to achieve the recovery of an abbreviated IPv6 address.
  echo ${ipv6Hex[@]} | sed 's/ /\:/g'
}

function getIPv6Address() {
# Differences from scope link, scope host and scope global of IPv6, reference: https://qiita.com/_dakc_/items/4eefa443306860bdcfde
  allI6Addrs=`ip -6 addr show | grep -wA 256 "$interface6" | grep -wv "lo" | grep -wv "link\|host" | grep -w "inet6" | grep "scope" | grep "global" | awk -F " " '{for (i=2;i<=NF;i++)printf("%s ", $i);print ""}' | awk '{print $1}'`
  i6Addr=`echo "$allI6Addrs" | head -n 1`
  i6AddrNum=`echo "$allI6Addrs" | wc -l`
  collectAllIpv6Addresses "$i6AddrNum"
  ip6Addr=`echo ${i6Addr} | cut -d'/' -f1`
  ip6Mask=`echo ${i6Addr} | cut -d'/' -f2`
  ip6Gate=`ip -6 route show default | grep -iv "warp\|wgcf\|wg[0-9]\|docker[0-9]" | grep -w "$interface\|$interface6" | grep -w "via" | grep "dev" | head -n 1 | awk -F " " '{for (i=3;i<=NF;i++)printf("%s ", $i);print ""}' | awk '{print$1}'`
# Get real IPv6 subnet of current System
  actualIp6Prefix=`ip -6 route show | grep -iv "warp\|wgcf\|wg[0-9]\|docker[0-9]" | grep -w "$interface\|$interface6" | grep -v "default" | grep -v "multicast" | grep -P '../[0-9]{1,3}' | head -n 1 | awk '{print $1}' | awk -F '/' '{print $2}'`
  [[ -z "$actualIp6Prefix" || "$i6AddrNum" -ge "2" ]] && actualIp6Prefix="$ip6Mask"
  transferIPv6AddressFormat "$ip6Addr" "$ip6Gate"
}

# $1 is "$ip6Addr", $2 is "$ip6Gate".
function transferIPv6AddressFormat() {
# Some Bi-Stack server has a public IPv4 address with a private IPv4 gateway and has a dhcp configuration for IPv6 stack,
# so we need to tell Debian installer IPv6 static configurations to config IPv6 network first by force.
  [[ "$BiStackPreferIpv6Status" == "1" ]] && Network6Config="isStatic"
# In some original template OS of cloud provider like Akile.io etc,
# if prefix of IPv6 mask is 128 in static network configuration, it means there is only one IPv6(current server itself) in the network.
# The following is the sample:
#
# auto eth0
#   iface eth0 inet6 static
#     address 2603:c020:8:a19b::ffff:e6da
#     gateway 2603:c020:8:a19b::ffff
#     netmask 128
#     dns-nameservers 2001:4860:4860::8888
#
# In this condition, if IPv6 gateway has a different address with IPv6 address, the Debian installer couldn't find the correct gateway.
# The installation will fail in the end. The reason is mostly the upstream wrongly configurated the current network of this system.
# So we try to revise this value for 8 levels to expand the range of the IPv6 network and help installer to find the correct gateway.
# DHCP IPv6 network(even IPv6 netmask is "128") may not be effected by this situation.
# The result of function ' ipv6SubnetCalc "$ip6Mask" ' is "$ip6Subnet"
# The following consulted calculations are calculated by Vultr IPv6 subnet calculator and IPv6 subnet range calculator which is provided by iP Jisuanqi.
# Reference: https://www.vultr.com/resources/subnet-calculator-ipv6/
#            https://ipjisuanqi.com/ipv6.html
  [[ "$Network6Config" == "isStatic" ]] && {
# IPv6 expansion algorithm code reference: https://blog.caoyu.info/expand-ipv6-by-shell.html
    ip6AddrWhole=`ultimateFormatOfIpv6 "$1"`
    ip6GateWhole=`ultimateFormatOfIpv6 "$2"`
    tmpIp6AddrFirst=`echo $ip6AddrWhole | sed 's/\(.\{4\}\).*/\1/' | sed 's/[a-z]/\u&/g'`
    tmpIp6GateFirst=`echo $ip6GateWhole | sed 's/\(.\{4\}\).*/\1/' | sed 's/[a-z]/\u&/g'`
    if [[ "$tmpIp6AddrFirst" != "$tmpIp6GateFirst" ]]; then
# If some brave guys set --network "static" by force, IPv6 address, mask and gateway of IPv6 DHCP configurations like Oracle Cloud etc. are:
# a public IPv6 address, a "128" mask, a local IPv6 gateway(starts with "fe80" mostly, like "fe80::200:f1e9:dec3:4ab").
# The value of mask must be set as "128", not "1" which determined by first condition of above because the local IPv6 address is unique in its' network
# and plays the role of IPv6 network discovery and identical authentication to ensure that authenticated device is certificated by upstream. 
# Explanation of using local IPv6 address as gateway quoted from Scott Hogg:
#
# Link-local IPv6 addresses are on every interface of every IPv6-enabled host and router. They are essential for LAN-based Neighbor Discovery communication.
# After the host has gone through the Duplicate Address Detection (DAD) process ensuring that its link-local address (and associated IID) is unique on the LAN segment,
# it then proceeds to sending an ICMPv6 Router Solicitation (RS) message sourced from that address.
#
# There are total three IPv6 address ranges divided into local address: fe80::/10, fec0::/10, fc00::/7.
# "fe80::/10" is similar with "169.254.0.0/16" of IPv4 of February, 2006 according to RFC 4291, ranges from fe80:0000:0000:0000:0000:0000:0000:0000 to febf:ffff:ffff:ffff:ffff:ffff:ffff:ffff.
# "fec0::/10" is similar with "192.168.0.0/16" of IPv4 which was deprecated and returned to public IPv6 address again of September, 2004 according to RFC 3879.
# The function of "fec0::/10" was replaced by "fc00::/7" of October, 2005 according to RFC 4193, ranges from fc00:0000:0000:0000:0000:0000:0000:0000 to fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff.
# So we need to calculate ranges of "fe80::/10" and "fc00::/7", if IPv6 address is public and IPv6 gateway belongs to local IPv6 address.
# English strings in hexadecimal must be converted as capital alphabets that comparison operations can be processed by shell.
# Reference: https://blogs.infoblox.com/ipv6-coe/fe80-1-is-a-perfectly-valid-ipv6-default-gateway-address/ chapter: Link-Local Address as Default Gateway
#            https://www.wdic.org/w/WDIC/IPv6%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9 chapter: アドレスの種類(Types of address) → エニキャストアドレス(Anycast address)
#            https://www.wdic.org/w/WDIC/IPv6%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9 chapter: サイトローカルアドレス(Site local address)
#            https://www.wdic.org/w/WDIC/%E3%83%A6%E3%83%8B%E3%83%BC%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%AB%E3%83%AB%E3%83%A6%E3%83%8B%E3%82%AD%E3%83%A3%E3%82%B9%E3%83%88%E3%82%A2%E3%83%89%E3%83%AC%E3%82%B9
#            https://www.ipentec.com/document/network-format-ipv6-local-adddress chapter: IPv6のリンクローカルアドレス(Link local address of IPv6)
#            https://www.rfc-editor.org/rfc/rfc4291.html#section-2.4 chapter: 2.4. Address Type Identification
      checkIfIpv4AndIpv6IsLocalOrPublic "" "$2"
      if [[ "$ipv6LocalOrPublicStatus" == '1' ]]; then
        tmpIp6Mask="64"
# Installer of Debian 11 and former doesn't support irregular IPv6 configs.
        [[ "$linux_relese" == 'debian' && -n $(echo $tmpDIST | grep -o "[0-9]") && "$tmpDIST" -le "11" && "$IPStackType" == "IPv6Stack" && "$Network6Config" == "isStatic" ]] && BurnIrregularIpv6Status='1'
      else
# If the IPv6 and IPv6 gateway are not in the same IPv6 A class, the prefix of netmask should be "1",
# transfer to whole IPv6 subnet address is 8000:0000:0000:0000:0000:0000:0000:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/1 is 0000:0000:0000:0000:0000:0000:0000:0000 - 7fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff, the gateway 2603:c020:0008:a19b:0000:0000:0000:ffff can be included.
        tmpIp6Mask="1"
      fi
    else
      ipv6SubnetCertificate "$ip6AddrWhole" "$ip6GateWhole"
    fi
# Too narrow of IPv6 prefix may cause some unpredictable risks.
    [[ "$tmpIp6Mask" -le "16" ]] && {
      [[ "$BiStackPreferIpv6Status" == "1" ]] || [[ "$linux_relese" == 'debian' || "$linux_relese" == 'kali' && "$IPStackType" == "IPv6Stack" && "$Network6Config" == "isStatic" ]] && BurnIrregularIpv6Status='1'
    }
    ip6Mask="$tmpIp6Mask"
# Because of function "ipv6SubnetCalc" includes self-increment,
# so we need to confirm the goal of IPv6 prefix and make function to operate only one time in the last to save performance and avoid all
# gears of IPv6 prefix which meets well with the conditions of above are transformed to whole IPv6 addresses in one variable.
# The same thought of moving function "netmask" to the last, only need to transform IPv4 prefix to whole IPv4 address for one time.
    ipv6SubnetCalc "$ip6Mask"
# So in summary of the IPv6 sample in above, we should assign subnet mask "ffff:ffff:ffff:ffff:ffff:ffff:0000:0000"(prefix is "96") for it.
  }
}

# $1 is "$ip6AddrWhole", $2 is "$$ip6GateWhole".
function ipv6SubnetCertificate() {
# If the IP and gateway are in the same IPv6 A class, not in the same IPv6 B class, the prefix of netmask should less equal than "16",
# transfer to whole IPv6 subnet address is ffff:0000:0000:0000:0000:0000:0000:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/16 is 2603:0000:0000:0000:0000:0000:0000:0000 - 2603:ffff:ffff:ffff:ffff:ffff:ffff:ffff, the gateway 2603:... can be included.
  [[ `echo $1 | cut -d':' -f 1` == `echo $2 | cut -d':' -f 1` ]] && tmpIp6Mask="16"
# If the IP and gateway are in the same IPv6 A B class, not in the same IPv6 C class, the prefix of netmask should less equal than "32",
# transfer to whole IPv6 subnet address is ffff:ffff:0000:0000:0000:0000:0000:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/32 is 2603:c020:0000:0000:0000:0000:0000:0000 - 2603:c020:ffff:ffff:ffff:ffff:ffff:ffff, the gateway 2603:... can be included.
  [[ `echo $1 | cut -d':' -f 1,2` == `echo $2 | cut -d':' -f 1,2` ]] && tmpIp6Mask="32"
# If the IP and gateway are in the same IPv6 A B C class, not in the same IPv6 D class, the prefix of netmask should less equal than "48",
# transfer to whole IPv6 subnet address is ffff:ffff:ffff:0000:0000:0000:0000:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/48 is 2603:c020:0008:0000:0000:0000:0000:0000 - 2603:c020:0008:ffff:ffff:ffff:ffff:ffff, the gateway 2603:... can be included.
  [[ `echo $1 | cut -d':' -f 1,2,3` == `echo $2 | cut -d':' -f 1,2,3` ]] && tmpIp6Mask="48"
# If the IP and gateway are in the same IPv6 A B C D class, not in the same IPv6 E class, the prefix of netmask should less equal than "64",
# transfer to whole IPv6 subnet address is ffff:ffff:ffff:ffff:0000:0000:0000:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/64 is 2603:c020:0008:a19b:0000:0000:0000:0000 - 2603:c020:0008:a19b:ffff:ffff:ffff:ffff, the gateway 2603:... can be included.
  [[ `echo $1 | cut -d':' -f 1,2,3,4` == `echo $2 | cut -d':' -f 1,2,3,4` ]] && tmpIp6Mask="64"
# If the IP and gateway are in the same IPv6 A B C D E class, not in the same IPv6 F class, the prefix of netmask should less equal than "80",
# transfer to whole IPv6 subnet address is ffff:ffff:ffff:ffff:ffff:0000:0000:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/80 is 2603:c020:0008:a19b:0000:0000:0000:0000 - 2603:c020:0008:a19b:0000:ffff:ffff:ffff, the gateway 2603:... can be included.
  [[ `echo $1 | cut -d':' -f 1,2,3,4,5` == `echo $2 | cut -d':' -f 1,2,3,4,5` ]] && tmpIp6Mask="80"
# If the IP and gateway are in the same IPv6 A B C D E F class, not in the same IPv6 G class, the prefix of netmask should less equal than "96",
# transfer to whole IPv6 subnet address is ffff:ffff:ffff:ffff:ffff:ffff:0000:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/96 is 2603:c020:0008:a19b:0000:0000:0000:0000 - 2603:c020:0008:a19b:0000:0000:ffff:ffff, the gateway 2603:... can be included.
  [[ `echo $1 | cut -d':' -f 1,2,3,4,5,6` == `echo $2 | cut -d':' -f 1,2,3,4,5,6` ]] && tmpIp6Mask="96"
# If the IP and gateway are in the same IPv6 A B C D E F G class, not in the same IPv6 H class, the prefix of netmask should less equal than "112",
# transfer to whole IPv6 subnet address is ffff:ffff:ffff:ffff:ffff:ffff:ffff:0000.
# The range of 2603:c020:8:a19b::ffff:e6da/112 is 2603:c020:0008:a19b:0000:0000:ffff:0000 - 2603:c020:0008:a19b:0000:0000:ffff:ffff, the gateway 2603:c020:0008:a19b:0000:0000:0000:ffff can't be included.
  [[ `echo $1 | cut -d':' -f 1,2,3,4,5,6,7` == `echo $2 | cut -d':' -f 1,2,3,4,5,6,7` ]] && tmpIp6Mask="112"
}

# $1 is $ip6Mask
function ipv6SubnetCalc() {
  tmpIp6Subnet=""
  ip6Subnet=""
  ip6SubnetEleNum=`expr $1 / 4`
  ip6SubnetEleNumRemain=`expr $1 - $ip6SubnetEleNum \* 4`
  if [[ "$ip6SubnetEleNumRemain" == 0 ]]; then
    ip6SubnetHex="0"
  elif [[ "$ip6SubnetEleNumRemain" == 1 ]]; then
    ip6SubnetHex="8"
  elif [[ "$ip6SubnetEleNumRemain" == 2 ]]; then
    ip6SubnetHex="c"
  elif [[ "$ip6SubnetEleNumRemain" == 3 ]]; then
    ip6SubnetHex="e"
  fi
  for ((i=1; i<="$ip6SubnetEleNum"; i++)); do
    tmpIp6Subnet+="f"
  done
  tmpIp6Subnet=$tmpIp6Subnet$ip6SubnetHex
  for ((j=1; j<=`expr 32 - $ip6SubnetEleNum`; j++)); do
    tmpIp6Subnet+="0"
  done
  if [[ `echo $tmpIp6Subnet | wc -c` -ge "33" ]]; then
    tmpIp6Subnet=`echo $tmpIp6Subnet | sed 's/.$//'`
  fi
  for ((k=0; k<=7; k++)); do
    ip6Subnet+=$(echo ${tmpIp6Subnet:`expr $k \* 4`:4})":"
  done
  ip6Subnet=`echo ${ip6Subnet%?}`
}

# $1 is "$iAddrNum".
function collectAllIpv4Addresses() {
  [[ "$1" -ge "2" && "$IPStackType" != "IPv6Stack" ]] && {
    Network4Config="isStatic"
    iAddrs=()
    for tmpIp in $allI4Addrs; do
      iAddrs[${#iAddrs[@]}]=$tmpIp
    done
  }
}

# $1 is "$iAddrNum", $2 is "in-target", $3 is 'netconfig file'.
function writeMultipleIpv4Addresses() {
  [[ "$1" -ge "2" && "$IPStackType" != "IPv6Stack" ]] && {
    if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]]; then
      unset iAddrs[0]
      for writeIps in ${iAddrs[@]}; do
        ipAddrItem="up ip addr add $writeIps dev $interface4"
        tmpWriteIpsCmd+=''$2' sed -i '\''$a\\t'$ipAddrItem''\'' '$3'; '
      done
      writeIpsCmd=$(echo $tmpWriteIpsCmd)
      SupportMultipleIPv4="$writeIpsCmd"
    elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
      for (( tmpIpIndex="0"; tmpIpIndex<"$1"; tmpIpIndex++ )); do
        writeIps="${iAddrs[$tmpIpIndex]}"
        ipv4AddressOrder=$(expr $tmpIpIndex + 1)
        ipAddrItem+='address'$ipv4AddressOrder'='$writeIps','$ipGate'\n'
      done
      ipAddrItem=$(echo ''$ipAddrItem'' | sed 's/..$//')
      deleteOriginalIpv4Coning='sed -ri '\''/address1.*/d'\'' '$3''
      addIpv4AddrsForRedhat='sed -i '\''/\[ipv4\]/a\'$ipAddrItem''\'' '$3''
    fi
  }
}

# $1 is "$i6AddrNum".
function collectAllIpv6Addresses() {
  [[ "$1" -ge "2" && "$IPStackType" != "IPv4Stack" ]] && {
    Network6Config="isStatic"
    i6Addrs=()
    for tmpIp6 in $allI6Addrs; do
# The best way to add several elements into an array by using "for" loop in the shell.
# Reference: https://linuxhandbook.com/bash-append-array/
      i6Addrs[${#i6Addrs[@]}]=$tmpIp6
    done
    if [[ "$IPStackType" == "IPv6Stack" ]] || [[ "$IPStackType" == "BiStack" && -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]]; then
# A sample result of the following arrays which were programmed by "for" loops:
#
# ${i6Addrs[@]}                         : 2606:a8c0:3:6f::b/64 2606:a8c0:3:6f::a/64 2606:a8c0:3::64/128
# ${allI6AddrsWithoutSuffix[@]}         : 2606:a8c0:3:6f::b 2606:a8c0:3:6f::a 2606:a8c0:3::64
# ${allI6AddrsWithUltimateFormat[@]}    : 2606:a8c0:0003:006f:0000:0000:0000:000b 2606:a8c0:0003:006f:0000:0000:0000:000a 2606:a8c0:0003:0000:0000:0000:0000:0064
# ${allI6AddrsWithOmittedClassesNum[@]} : 3 3 4
# $omittedClassesMaxNum                 : 4
# $mainIp6Index                         : 2
# $i6Addr                               : 2606:a8c0:3::64/128
#
# To find out the segment with the largest range of one IPv6 in all of the IPv6s as default to config IPv6 network in netboot environment for machines of IPv6 stack.
      allI6AddrsWithoutSuffix=()
      for tmpIp6 in ${i6Addrs[@]}; do
        tmpIp6=$(echo $tmpIp6 | cut -d'/' -f1)
        allI6AddrsWithoutSuffix[${#allI6AddrsWithoutSuffix[@]}]=$tmpIp6
      done
      allI6AddrsWithUltimateFormat=()
      for tmpIp6 in ${allI6AddrsWithoutSuffix[@]}; do
        tmpIp6=$(ultimateFormatOfIpv6 "$tmpIp6")
        allI6AddrsWithUltimateFormat[${#allI6AddrsWithUltimateFormat[@]}]=$tmpIp6
      done
      allI6AddrsWithOmittedClassesNum=()
      for tmpIp6 in ${allI6AddrsWithUltimateFormat[@]}; do
        tmpIp6=$(echo $tmpIp6 | grep -oi "0000" | wc -l)
        allI6AddrsWithOmittedClassesNum[${#allI6AddrsWithOmittedClassesNum[@]}]=$tmpIp6
      done
      omittedClassesMaxNum=${allI6AddrsWithOmittedClassesNum[0]}
      for tmpIp6 in ${!allI6AddrsWithOmittedClassesNum[@]}; do
        if [[ "$omittedClassesMaxNum" -le "${allI6AddrsWithOmittedClassesNum[${tmpIp6}]}" ]]; then
          omittedClassesMaxNum=${allI6AddrsWithOmittedClassesNum[${tmpIp6}]}
        fi
      done
      getArrItemIdx "${allI6AddrsWithOmittedClassesNum[*]}" "$omittedClassesMaxNum"
      mainIp6Index="$index"
      i6Addr=${i6Addrs[$mainIp6Index]}
    fi
  }
}

# Debian installer can't accept any command that writing multi lines by one "sed -i" or "echo -e" etc in "preseed.cfg".
# For example, if we want to add two lines or more like "up ip addr add IPv6one/48 dev eth0" and "up ip addr add IPv6two/40 dev eth0" to "network file",
# using "sed -i '$a\\tup ip addr add IPv6one/48 dev eth0' 'network file';" and then "sed -i '$a\\tup ip addr add IPv6two/40 dev eth0' 'network file';" is necessary.
# Otherwise, if try to use "sed -i '$a\\tup ip addr add IPv6one/48 dev eth0\n\tup ip addr add IPv6two/40 dev eth0' 'network file';" 
# to add two IPv6 addresses config lines in the same "sed -i", Debian installer will meet a fatal.
#
# An excellent method to add multiple IPv6 addresses and the IPv6 gateway of them in Bi-stack(dual-stack) network configuration file for Debian/Kali, here is the sample:
#
# allow-hotplug eth0
# iface eth0 inet static
#     address 59.67.82.30
#     gateway 59.67.82.1
#     netmask 255.255.255.0
#     dns-nameservers 1.0.0.1 8.8.4.4 2606:4700:4700::1001 2001:4860:4860::8844
#     up ip addr add 2a12:a520:d420::736f/48 dev eth0
#     up ip addr add 2a12:a520:2e0b::a89c:11de/40 dev eth0
#     up ip -6 route add 2a12:a520:2e0b:0000:0000:0000:0000:0001 dev eth0
#     up ip -6 route add default via 2a12:a520:2e0b:0000:0000:0000:0000:0001 dev eth0
#
# A standard format of adding multiple IPv6 configs into IPv6 stack server for Debian series:
#
# allow-hotplug enp3s0
# iface enp3s0 inet6 static
#	    address 2606:a8c0:3::64/128
#	    gateway 2606:a8c0:3::1
#	    dns-nameservers 2606:4700:4700::1001 2001:4860:4860::8844
#   	dns-search debian
# 	  up ip addr add 2606:a8c0:3:6f::3b/64 dev enp3s0
#	    up ip addr add 2606:a8c0:3:6f::a/64 dev enp3s0
#
# A standard formart of adding multiple IPv6 addresses for the second network adapter in Bi-stack(dual-stack) server for Debian series:
# The first network adapter which is called such as "eth0" plays a role of establishing IPv4 stack network,
# and then the second network adapter of "eth1" is responsible of creating multiple terms of IPv6 stack networking configurations.
# This uncommon and extreme situation can only be applied for Debian series at current because the file of "/etc/network/interfaces" is easily to be modified.
#
# allow-hotplug eth0
# iface eth0 inet static
#     address 104.36.84.237/32
#     gateway 104.36.84.1
#     dns-nameservers 1.0.0.1 8.8.4.4
#
# allow-hotplug eth1
# iface eth1 inet6 static
#     address 2606:a8c0:3::64/128
#     gateway 2606:a8c0:3::1
#     dns-nameservers 2606:4700:4700::1001 2001:4860:4860::8844
#     up ip -6 addr add 2606:a8c0:3:6f::2f/64 dev eth1
#     up ip -6 addr add 2606:a8c0:3:6f::1c/64 dev eth1
#
# $1 is "$i6AddrNum", $2 is "in-target", $3 is 'netconfig file'.
function writeMultipleIpv6Addresses() {
  [[ "$1" -ge "2" && "$IPStackType" != "IPv4Stack" ]] && {
# For environment of IPv6 stack, one main IPv6 config will be written to system by "preseed" or "kickstart" into the unattend file to config the network firstly.
# So the main IPv6 config should be excluded in the array of "i6Addrs[@]" for the later stage of writing other IPv6s to the network config file in the newly installed system. 
    if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]]; then
      if [[ "$IPStackType" == "IPv6Stack" ]] || [[ "$IPStackType" == "BiStack" && -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]]; then
        unset i6Addrs[$mainIp6Index]
      fi
      for writeIp6s in ${i6Addrs[@]}; do
        [[ "$IPStackType" == "BiStack" && -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]] && ip6AddrItem="up ip -6 addr add $writeIp6s dev $interface6" || ip6AddrItem="up ip addr add $writeIp6s dev $interface6"
        tmpWriteIp6sCmd+=''$2' sed -i '\''$a\\t'$ip6AddrItem''\'' '$3'; '
      done
      writeIp6sCmd=$(echo $tmpWriteIp6sCmd)
      writeIp6GateCmd=''$2' sed -i '\''$a\\tup ip -6 route add '$ip6Gate' dev '$interface6''\'' '$3'; '$2' sed -i '\''$a\\tup ip -6 route add default via '$ip6Gate' dev '$interface6''\'' '$3';'
      addIpv6DnsForPreseed=''$2' sed -ri '\''s/'$ipDNS'/'$ipDNS' '$ip6DNS'/g'\'' '$3';'
      preferIpv6Access=''$2' sed -i '\''$alabel 2002::/16'\'' /etc/gai.conf; '$2' sed -i '\''$alabel 2001:0::/32'\'' /etc/gai.conf;'
      SupportMultipleIPv6=''$writeIp6sCmd' '$writeIp6GateCmd' '$addIpv6DnsForPreseed' '$preferIpv6Access''
      [[ "$IPStackType" == "IPv6Stack" ]] && SupportIPv6orIPv4=''$writeIp6sCmd' '$preferIpv6Access''
      [[ "$IPStackType" == "BiStack" && -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]] && {
        addIpv6Adapter=''$2' sed -i '\''$a\ '\'' '$3'; '$2' sed -i '\''$aallow-hotplug '$interface6''\'' '$3';'
        addFirstIpv6Config=''$2' sed -i '\''$aiface '$interface6' inet6 static'\'' '$3'; '$2' sed -i '\''$a\\taddress '$i6Addr''\'' '$3'; '$2' sed -i '\''$a\\tgateway '$ip6Gate''\'' '$3'; '$2' sed -i '\''$a\\tdns-nameservers '$ip6DNS''\'' '$3';'
        SupportMultipleIPv6=''$addIpv6Adapter' '$addFirstIpv6Config' '$writeIp6sCmd' '$preferIpv6Access''
      }
    elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
# The following strategy of adding multiple IPv6 addresses with subnet, gateway and DNS parameters is only suitable for
# Redhat series(9+, Fedora 30+) which are using "NetworkManager" to manage the configurations of the networking by default.
# The first IPv6 address will be written to the target system which has a native syntax support was provided by kickstart from Redhat,
# so we just need to add the second and more IPv6 addresses in the late command of the kickstart which area is involved from "%post" to "%end".
      for (( tmpI6Index="0"; tmpI6Index<"$1"; tmpI6Index++ )); do
        writeIp6s="${i6Addrs[$tmpI6Index]}"
        ipv6AddressOrder=$(expr $tmpI6Index + 1)
        ip6AddrItem+='address'$ipv6AddressOrder'='$writeIp6s','$ip6Gate'\n'
      done
      ip6AddrItems=''$ip6AddrItem''
      addIpv6DnsForRedhat='dns='$ip6DNS1';'$ip6DNS2';'
      addIpv6AddrsForRedhat='sed -i '\''/addr-gen-mode=eui64/a\'$ip6AddrItems''$addIpv6DnsForRedhat''\'' '$3''
# Make sure to match "method=auto" only for IPv6 selection so that to avoid if some situations of "method=auto" as of IPv4 configuration.
      setIpv6ConfigMethodForRedhat='sed -ri '\'':label;N;s/addr-gen-mode=eui64\nmethod=auto/addr-gen-mode=eui64\nmethod=manual/;b label'\'' '$3''
      [[ "$IPStackType" == "IPv6Stack" ]] && { ip6AddrItems=$(echo $ip6AddrItem | sed 's/..$//'); deleteOriginalIpv6Coning='sed -ri '\''/address1.*/d'\'' '$3''; addIpv6AddrsForRedhat='sed -i '\''/addr-gen-mode=eui64/a\'$ip6AddrItems''\'' '$3''; setIpv6ConfigMethodForRedhat=""; }
    fi
  }
}

# This function help us to sort sizes for different files from different directions.
# "$FilesDirArr" storages original absolute pathes of files.
# "$FilesLineArr" receives amount of alphabets and numbers etc. in one file from "$FilesDirNum"
# "$FilesDir" is the list of absolute files' pathes those are executed by command like "grep" etc.
# According to file size, "$tmpSizeArray" sorts "$FilesLineArr"'s numbers from smallest to largest(-sort h) or from largest to smallest(-sort hr).
# "$1" are direction of files, "$2" is sort method.
function sortFileSize() {
  FilesDirArr=()
  FilesLineArr=()
  FilesDir="$1"

  for Count in $FilesDir; do
    FilesDirArr+=($Count)
    FilesDirNum=`cat $Count | wc -c`
    FilesLineArr+=($FilesDirNum)
  done
  
  tmpSizeArray=(`echo ${FilesLineArr[*]} | tr ' ' '\n' | $2`)
}

# This function may help us to find the index order in one array if we provide a random data in this array.
# "$1" is one array like "${FilesLineArr[*]}", "$2" is one element which index of this array needs to be found like "${tmpSizeArray[0]}"
function getArrItemIdx() {
  arr=$1
  item=$2
  index=0

  for i in ${arr[*]}; do
    [[ $item == $i ]] && {
      echo $index >>/dev/null 2>&1
      return
    }
    index=$(( $index + 1 ))
  done
}

# "$1" is the absolute path of a file.
function splitDirAndFile() {
  FileName=`echo $1 | awk -F/ '{print $NF}'`
  FileDirection=`echo $1 | sed "s/$FileName//g"`
}

# In Debian 11 OS template of DigitalOcean, there are 5 directions deposing network configurations after filtered by command of "find" and "grep":
# /run/network/interfaces.d/eth0            31  bytes
# /run/network/interfaces.d/eth1            31  bytes
# /etc/network/interfaces                   755 bytes
# /etc/network/interfaces.d/50-cloud-init   716 bytes
# /etc/network/cloud-interfaces-template    39  bytes
# We should get help by some algorithms to select the largest size of the file, the correct network configuration, "/etc/network/interfaces" is just there.
#
# "$1" is an array which storages temp files. "$2" is sort method, "sort -hr" is largest, "sort -h" is smallest.
function getLargestOrSmallestFile() {
  for Count in "$1"; do
    sortFileSize "$Count" "$2"
    getArrItemIdx "${FilesLineArr[*]}" "${tmpSizeArray[0]}"
    fullFilePath="${FilesDirArr[$index]}"
    [[ "$fullFilePath" != "" ]] && {
      splitDirAndFile "$fullFilePath"
      break
    } 
  done
}

# A function about parsing "*.yaml" files by native bash.
# Reference: https://stackoverflow.com/questions/5014632/how-can-i-parse-a-yaml-file-from-a-linux-shell-script
function parseYaml() {
  prefix=$2
  s='[[:space:]]*' w='[a-zA-Z0-9_]*'
  fs=$(echo @|tr @ '\034')
  sed -ne "s|,$s\]$s\$|]|" \
      -e ":1;s|^\($s\)\($w\)$s:$s\[$s\(.*\)$s,$s\(.*\)$s\]|\1\2: [\3]\n\1  - \4|;t1" \
      -e "s|^\($s\)\($w\)$s:$s\[$s\(.*\)$s\]|\1\2:\n\1  - \3|;p" $1 | \
  sed -ne "s|,$s}$s\$|}|" \
      -e ":1;s|^\($s\)-$s{$s\(.*\)$s,$s\($w\)$s:$s\(.*\)$s}|\1- {\2}\n\1  \3: \4|;t1" \
      -e "s|^\($s\)-$s{$s\(.*\)$s}|\1-\n\1  \2|;p" | \
  sed -ne "s|^\($s\):|\1|" \
      -e "s|^\($s\)-$s[\"']\(.*\)[\"']$s\$|\1$fs$fs\2|p" \
      -e "s|^\($s\)-$s\(.*\)$s\$|\1$fs$fs\2|p" \
      -e "s|^\($s\)\($w\)$s:$s[\"']\(.*\)[\"']$s\$|\1$fs\2$fs\3|p" \
      -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p" | \
  awk -F$fs '{
    indent=length($1)/2
    vname[indent]=$2
    for (i in vname) {if (i>indent) {delete vname[i]; idx[i]=0}}
    if (length($2)==0) {vname[indent]= ++idx[indent]}
    if (length($3)>0) {
      vn=""
      for (i=0;i<indent;i++) {vn=(vn)(vname[i])("_")}
      printf("%s%s%s=\"%s\"\n","'$prefix'",vn,vname[indent],$3)
    }
  }'
}

# $1 is $CurrentOS
function getInterface() {
# Network config file for Ubuntu 16.04 and former version, 
# Debian all version included the latest Debian 11 is deposited in /etc/network/interfaces, they managed by "ifupdown".
# Ubuntu 18.04 and later version, using netplan to replace legacy ifupdown, the network config file is in /etc/netplan/
  interface=""
  Interfaces=()
  allInterfaces=`cat /proc/net/dev | grep ':' | cut -d':' -f1 | sed 's/\s//g' | grep -iv '^lo\|^sit\|^stf\|^gif\|^dummy\|^vmnet\|^vir\|^gre\|^ipip\|^ppp\|^bond\|^tun\|^tap\|^ip6gre\|^ip6tnl\|^teql\|^ocserv\|^vpn\|^warp\|^wgcf\|^wg\|^docker'`
  for interfaceItem in $allInterfaces; do
    Interfaces[${#Interfaces[@]}]=$interfaceItem
  done
  interfacesNum="${#Interfaces[*]}"
# Some server has two different network adapters and for example: eth0 is for IPv4, eth1 is for IPv6, so we need to distinguish whether they are the same.
  default4Route=`ip -4 route show default | grep "^default"`
# In Vultr server of 2.5$/mo plan, it has only IPv6 address, so the default route is via IPv6. 
  default6Route=`ip -6 route show default | grep "^default"`
  for item in ${Interfaces[*]}; do
    [ -n "$item" ] || continue
    echo "$default4Route" | grep -q "$item"
    [ $? -eq 0 ] && interface4="$item" && break
  done
  for item in ${Interfaces[*]}; do
    [ -n "$item" ] || continue
    echo "$default6Route" | grep -q "$item"
    [ $? -eq 0 ] && interface6="$item" && break
  done
  interface="$interface4 $interface6"
  [[ "$interface4" == "$interface6" ]] && interface=`echo "$interface" | cut -d' ' -f 1`
  [[ -z "$interface4" || -z "$interface6" ]] && {
    interface=`echo "$interface" | sed 's/[[:space:]]//g'`
    [[ -z "$interface4" ]] && interface4="$interface"
    [[ -z "$interface6" ]] && interface6="$interface"
  }
  echo "$interface" > /dev/null
  getArrItemIdx "${Interfaces[*]}" "$interface4"
  interface4DeviceOrder="$index"
  getArrItemIdx "${Interfaces[*]}" "$interface6"
  interface6DeviceOrder="$index"
# Some templates of cloud provider like Bandwagonhosts, Ubuntu 22.04, may modify parameters in " GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0" " in /etc/default/grub
# to make Linux kernel redirect names of network adapters from real name like ens18, ens3, enp0s4 to eth0, eth1, eth2...
# This setting may confuse program to get real adapter name from reading /proc/cat/dev
  GrubCmdLine=`grep "GRUB_CMDLINE_LINUX" /etc/default/grub | grep -v "#" | grep "net.ifnames=0\|biosdevname=0"`
# So we need to comfirm whether adapter name is renamed and whether we should inherit it into new system.
  [[ -n "$interfaceSelect" ]] && { interface="$interfaceSelect"; interface4="$interface"; interface6="$interface"; }
  if [[ -n "$GrubCmdLine" && -z "$interfaceSelect" ]] || [[ "$interface4" =~ "eth" ]] || [[ "$interface6" =~ "eth" ]]|| [[ "$linux_relese" == 'kali' ]] || [[ "$linux_relese" == 'alpinelinux' ]]; then
    setInterfaceName='1'
  fi
  [[ -z "$tmpDHCP" ]] && {
    if [[ "$1" == 'CentOS' || "$1" == 'AlmaLinux' || "$1" == 'RockyLinux' || "$1" == 'Fedora' || "$1" == 'Vzlinux' || "$1" == 'OracleLinux' || "$1" == 'OpenCloudOS' || "$1" == 'AlibabaCloudLinux' || "$1" == 'ScientificLinux' || "$1" == 'AmazonLinux' || "$1" == 'RedHatEnterpriseLinux' || "$1" == 'OpenAnolis' || "$1" == 'CloudLinux' ]]; then
      [[ ! $(find / -maxdepth 5 -path /*network-scripts -type d -print -or -path /*system-connections -type d -print) ]] && {
        echo -ne "\n[${red}Error${plain}] Invalid network configuration!\n"
        exit 1
      }
      NetCfgWhole=()
      tmpNetCfgFiles=""
      for Count in $(find / -maxdepth 5 -path /*network-scripts -type d -print -or -path /*system-connections -type d -print); do
        NetCfgDir="$Count""/"
# If "NetworkManager" replaced "network-scripts", there is a file called "readme-ifcfg-rh.txt" in dir: /etc/sysconfig/network-scripts/
        # NetCfgFile=`ls -Sl $NetCfgDir 2>/dev/null | awk -F' ' '{print $NF}' | grep -iv 'lo\|sit\|stf\|gif\|dummy\|vmnet\|vir\|gre\|ipip\|ppp\|bond\|tun\|tap\|ip6gre\|ip6tnl\|teql\|ocserv\|vpn\|readme' | grep -s "$interface" | head -n 1`
# Condition of "grep -iv 'lo\|sit\|stf..." has been deperated because the config file name of "NetworkManager" which initiated by "cloud init" is like "cloud-init-eth0.nmconnection".
# Different from command "grep", command "ls" can only show file name but not full file direction.
# There are 3 files named "ifcfg-ens18  ifcfg-eth0  ifcfg-eth1" in dir "/etc/sysconfig/network-scripts/" of Almalinux 8 of Bandwagonhosts template.
# We should select the correct one by adjust whether includes interface name and file size.
# Files in "/etc/sysconfig/network-scripts/", reference: https://zetawiki.com/wiki/%EB%B6%84%EB%A5%98:/etc/sysconfig/network-scripts
        NetCfgFiles=`ls -Sl $NetCfgDir 2>/dev/null | awk -F' ' '{print $NF}' | grep -iv 'readme\|ifcfg-lo\|ifcfg-bond\|ifup\|ifdown\|vpn\|init.ipv6-global\|network-functions' | grep -s "ifcfg\|nmconnection"`
        for Files in $NetCfgFiles; do
          if [[ `grep -w "$interface4\|$interface6" "$NetCfgDir$Files"` != "" ]]; then
            tmpNetCfgFiles+=$(echo -e "\n""$NetCfgDir$Files")
          fi
        done
        getLargestOrSmallestFile "$tmpNetCfgFiles" "sort -hr"
        NetCfgFile="$FileName"
# In Google Cloud Platform, network configuration files of Redhat Enterprise 8+, CentOS-stream 8+, RockyLinux 8+ are all named " 'Wired connection 1.nmconnection' " in "/run/NetworkManager/system-connections/" direction.
# Yes, that's right, the name of this file includes spaces and two single quotes which are in the first and last.
# Only command "ls" can show the whole file name:
#
# [root@instance-2 ~]# ls -l /run/NetworkManager/system-connections/
# total 4
# -rw-------. 1 root root 270 May  4 22:15 'Wired connection 1.nmconnection'
#
# Many commands in linux can't handle these son of bitches because single quote is a strong reference so that the strings between two single quotes can't be any parameters.
# The most typical case is when you search these fuckin files by "grub", the result deleted two single quotes automatically like:
#
# [root@instance-2 ~]# grep -r "ipv4" /run/NetworkManager/system-connections/
# /run/NetworkManager/system-connections/Wired connection 1.nmconnection:[ipv4]
# 
# When we try to use command "head" and "tail" to be pipeline items after the first command "ls", the result is also the same:
#
# [root@instance-2 ~]# ls /run/NetworkManager/system-connections/ | head -n 1 | tail -n 1
# Wired connection 1.nmconnection
#
# A file name includes space is very dangerous in linux because the operating system will use a couple of single quotes to bundle it as a "not be referenced" file to prevent os identify them error.
# No matter what command you choice, unless attach its' absolute direction and execute it with other commands directly in the shell, it can work correctly, otherwise you wanna be cried when handle them by parameters transactions.
# We should use "grep" to extract which key words we need and print the result to another file.
# If this universe has hell, those jackass  who deployed these tortured settings of OS templates works on Google Cloud Platform will go to there when they died.
        if [[ ! -z "$NetCfgFile" && ! -f "$NetCfgDir$NetCfgFile" ]]; then
          tmpNetcfgDir="/root/tmp/installNetcfgCollections/"
          [[ ! -d "$tmpNetcfgDir" ]] && mkdir -p "$tmpNetcfgDir"
          if [[ "$NetCfgFile" =~ "nmconnection" ]]; then
            NetCfgFile="$interface.nmconnection"
            grep -wr "$interface\|\[ipv4\]\|\[ipv6\]\|\[connection\]\|\[ethernet\]\|id=*\|interface-name=*\|type=*\|method=*" "$NetCfgDir" | cut -d ':' -f 2 | tee -a "$tmpNetcfgDir$NetCfgFile"
            NetCfgDir="$tmpNetcfgDir"
          elif [[ "$NetCfgFile" =~ "ifcfg" ]]; then
            NetCfgFile="$ifcfg-$interface"
            grep -wr "$interface\|BOOTPROTO=*\|DEVICE=*\|ONBOOT=*\|TYPE=*\|HWADDR=*\|IPV6_AUTOCONF=*\|DHCPV6C=*" "$NetCfgDir" | cut -d ':' -f 2 | tee -a "$tmpNetcfgDir$NetCfgFile"
            NetCfgDir="$tmpNetcfgDir"
          fi
        fi
# The following conditions must appeared at least 3 times in a vaild network config file.
        [[ `grep -wcs "$interface4\|$interface6\|BOOTPROTO=*\|DEVICE=*\|ONBOOT=*\|TYPE=*\|HWADDR=*\|id=*\|\[connection\]\|interface-name=*\|type=*\|method=*" $NetCfgDir$NetCfgFile` -ge "3" ]] && {
# In AlmaLinux 9 template of DigitalOcean, network adapter name is "eth0", there are two network config files in the OS, and they all belong to "eth0".
# /etc/sysconfig/network-scripts/ifcfg-eth0
# /etc/NetworkManager/system-connections/eth0.nmconnection
# Which is the vaild one? We can storage them to one array first.
          NetCfgWhole+=("$NetCfgDir$NetCfgFile")
        }
      done
# If index "1"(starts in "0") is not empty, it means there at least two network config files in current OS.
      if [[ "${NetCfgWhole[1]}" != "" ]]; then
        for c in "${NetCfgWhole[@]}"; do
# Cloud providers usually use automatic tools like SolusVM or Cloud-init etc. to initial different Linux OS.
# The first row of the network config files is showed like the following example regularly:
# # Generated by SolusVM
# # Created by cloud-init on instance boot automatically, do not edit.
# So the "#" and preposition "(did something) by (who)" is a obvious hint to help us to distinguish:
          [[ `sed -e "4"p "$c" | grep " by " | grep -c "#"` -ge "1" ]] && {
            NetCfgWhole="$c"
            break
          }
        done
# If the array of "${NetCfgWhole}" doesn't be turned into a parameter, it means there are not any annotates generated by automatic tools.
# We need to import command "declare" to make an inspection to comfirm whether it's an array or a parameter,
# If it's still an arrary, we can only assume the index "0" in this array as the valid network config file.
        [[ `declare -p NetCfgWhole 2>/dev/null | grep -iw '^declare -a'` ]] && {
          NetCfgWhole="${NetCfgWhole[0]}"
        }
      fi
      splitDirAndFile "$NetCfgWhole"
      NetCfgFile="$FileName"
      NetCfgDir="$FileDirection"
    else
      readNetplan=$(find $(echo `find / -maxdepth 4 -path /*netplan`) -maxdepth 1 -name "*.yaml" -print)
      readIfupdown=$(find / -maxdepth 5 -path /*network -type d -print | grep -v "lib\|systemd")
      if [[ ! -z "$readNetplan" ]]; then
# Ubuntu 18+ network configuration
        networkManagerType="netplan"
        tmpNetCfgFiles=""
        for Count in $readNetplan; do
          tmpNetCfgFiles+=$(echo -e "\n"`grep -wrl "network" | grep -wrl "ethernets" | grep -wrl "$interface4\|$interface6" "$Count" 2>/dev/null`)
        done
        getLargestOrSmallestFile "$tmpNetCfgFiles" "sort -hr"
        NetCfgFile="$FileName"
        NetCfgDir="$FileDirection"
        NetCfgWhole="$NetCfgDir$NetCfgFile"
      elif [[ ! -z "$readIfupdown" ]]; then
# Debian/Kali/AlpineLinux network configuration
# Some versions of Ubuntu 18 like virmach template use ifupdown not netplan.
        networkManagerType="ifupdown"
# Collect all eligible config files by the several parent directions names "network".
# Reference: https://wiki.debian.org/NetworkConfiguration           
#            https://wiki.debian.org/IPv6PrefixDelegation
        tmpNetCfgFiles=""
        for Count in $readIfupdown; do
          if [[ "$IPStackType" == "IPv4Stack" ]]; then
            NetCfgFiles=`grep -wrl 'iface' | grep -wrl "auto\|dhcp\|static\|manual" | grep -wrl 'inet\|ip addr\|ip route' "$Count""/" 2>/dev/null | grep -v "if-*" | grep -v "state" | grep -v "helper" | grep -v "template"`
          elif [[ "$IPStackType" == "BiStack" ]] || [[ "$IPStackType" == "IPv6Stack" ]]; then
            NetCfgFiles=`grep -wrl 'iface' | grep -wrl "auto\|dhcp\|static\|manual" | grep -wrl 'inet\|ip addr\|ip route\|inet6\|ip -6' "$Count""/" 2>/dev/null | grep -v "if-*" | grep -v "state" | grep -v "helper" | grep -v "template"`
          fi
          for Files in $NetCfgFiles; do
            if [[ `grep -w "$interface4\|$interface6" "$Files"` != "" ]]; then
              tmpNetCfgFiles+=$(echo -e "\n""$Files")
            fi
          done
        done
        getLargestOrSmallestFile "$tmpNetCfgFiles" "sort -hr"
        NetCfgFile="$FileName"
        NetCfgDir="$FileDirection"
        NetCfgWhole="$NetCfgDir$NetCfgFile"
      else
        echo -ne "\n[${red}Error${plain}] Invalid network configuration!\n"
        exit 1
      fi
    fi
  }
}

# $1 is "$ipMask", $2 is "$ip6Mask". Can only accept prefix number transmit.
function acceptIPv4AndIPv6SubnetValue() {
  [[ -n "$1" ]] && {
    if [[ `echo "$1" | grep '^[[:digit:]]*$'` && "$1" -ge "1" && "$1" -le "32" ]]; then
      ipPrefix="$1"
      actualIp4Prefix="$ipPrefix"
      ipMask=`netmask "$1"`
      actualIp4Subnet=`netmask "$1"`
    else
      echo -ne "\n[${red}Warning${plain}] Only accept prefix format of IPv4 address, length from 1 to 32."
      echo -ne "\nIPv4 CIDR Calculator: https://www.vultr.com/resources/subnet-calculator/\n"
      exit 1
    fi
  }
  [[ -n "$2" ]] && {
    if [[ `echo "$2" | grep '^[[:digit:]]*$'` && "$2" -ge "1" && "$2" -le "128" ]]; then
      actualIp6Prefix="$2"
      ipv6SubnetCalc "$2"
    else
      echo -ne "\n[${red}Warning${plain}] Only accept prefix format of IPv6 address, length from 1 to 128."
      echo -ne "\nIPv6 CIDR Calculator: https://en.rakko.tools/tools/27/\n"
      exit 1
    fi
  }
}

# To confuse whether ipv4 is dhcp or static and whether ipv6 is dhcp or static in Redhat like os in version 9 and later,
# $1 is $NetCfgDir, $2 is $NetCfgFile, $3 is "ipv4" or "ipv6", $4 is "method="
function checkIpv4OrIpv6ConfigForRedhat9Later() {
  IpTypeLine="`awk '/\['$3'\]/{print NR}' $1/$2 | head -n 2 | tail -n 1`"
  ConnectTypeArray=()
  CtaSpace=()
  for tmpConnectType in `awk '/'$4'/{print NR}' $1/$2`; do
    ConnectTypeArray+=("$tmpConnectType" "$ConnectTypeArray")
    [[ `expr $tmpConnectType - $IpTypeLine` -gt "0" ]] && CtaSpace+=(`expr "$tmpConnectType" - "$IpTypeLine"` "$CtaSpace")
  done
  minArray=${CtaSpace[0]}
  for ((i=1;i<=`grep -io "$4" $1/$2 | wc -l`;i++)); do
    for j in ${CtaSpace[@]}; do
      [[ "$minArray" -gt "$j" ]] && minArray=$j
    done
  done
  NetCfgLineNum=`expr $minArray + $IpTypeLine`
}

# For those IPv6 only servers which Redhat series OS are need to be installed in environment of anaconda,
# we need to assign a valid IPv6 config in grub so that "install.img" can be loaded.
# Reference: https://www.golinuxcloud.com/ipv6-uefi-pxe-boot-kickstart-rhel-centos-8/#Step-8_Configure_grubcfg_Dracut_Kernel_Menu
#            https://binaryfury.wann.net/2016/03/installing-centos-7-on-an-ipv6-only-system/
function ipv6ForRedhatGrub() {
  if [[ "$IPStackType" == "IPv6Stack" ]]; then
    ipv6NameserverForKsGrub="nameserver=$ip6DNS1 nameserver=$ip6DNS2"
    if [[ "$Network6Config" == "isStatic" ]]; then
      ipv6StaticConfForKsGrub="noipv4 ip=[$ip6Addr]::[$ip6Gate]:$actualIp6Prefix::$interface:none $ipv6NameserverForKsGrub"
    else
      ipv6StaticConfForKsGrub="noipv4 $ipv6NameserverForKsGrub"
    fi
  fi
}

# If original system using DHCP, skip IP address, subnet mask, gateway, DNS server settings manually.
# In many DHCP servers, manual settings may cause some additional problems.
# For example, in Hetzner's machine, the network configuration of official template is DHCP for IPv4, STATIC for IPv6,
# If we config both IPv4 and IPv6 as STATIC, IPv4 network will failure, even though according to the bullshit network config guide which provided by Hetzner:
# https://docs.hetzner.com/cloud/servers/static-configuration/
# So we need to distinguish whether IPv4 is DHCP or STATIC and whether IPv6 is DHCP or STATIC separately and clearly.

# $1 is $CurrentOS, $2 is $CurrentOSVer, $3 is $IPStackType
function checkDHCP() {
  getInterface "$1"
  [[ -z "$tmpDHCP" ]] && {
    if [[ "$1" == 'CentOS' || "$1" == 'AlmaLinux' || "$1" == 'RockyLinux' || "$1" == 'Fedora' || "$1" == 'Vzlinux' || "$1" == 'OracleLinux' || "$1" == 'OpenCloudOS' || "$1" == 'AlibabaCloudLinux' || "$1" == 'ScientificLinux' || "$1" == 'AmazonLinux' || "$1" == 'RedHatEnterpriseLinux' || "$1" == 'OpenAnolis' || "$1" == 'CloudLinux' ]]; then
# RedHat like linux system 8 and before network config name is "ifcfg-interface", deposited in /etc/sysconfig/network-scripts/
# RedHat like linux system 9 and later network config name is "interface.nmconnection", deposited in /etc/NetworkManager/system-connections/
# In some templates like RockyLinux 9 x64 of DigitalOcean, both "/etc/sysconfig/network-scripts/ifcfg-eth0" and "/etc/NetworkManager/system-connections/ens3.nmconnection" are existed.
# in "ifcfg-eth0", BOOTPROTO=none; in "ens3.nmconnection", [ipv4] method=auto. the actually network adapter is "eth0", so the vaild network config file name is "ifcfg-eth0".
# So we need to check the type of the network configuration file to determine whether the method of config is dhcp or static.
      if [[ "$NetCfgFile" =~ "ifcfg" ]]; then
# "BOOTPROTO=dhcp" is for IPv4 DHCP, "=none" or "=static" is Static.
# "IPv6_AUTOCONf=yes" or "DHCPV6C=yes" is IPv6 DHCP, "=no" is IPv6 Static.
# For IPv6 STATIC configuration, "IPv6_AUTOCONf=no" or "DHCPV6C=no" doesn't exist is allowed.
# For IPv6 DHCP configuration, "IPv6_AUTOCONf=yes" or "DHCPV6C=yes" is necessary.
# Reference: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/s1-networkscripts-interfaces
        if [[ "$3" == "IPv4Stack" ]]; then
          Network6Config="isDHCP"
          [[ -n `timeout 4s grep -Ewirn "BOOTPROTO=none|BOOTPROTO=\"none\"|BOOTPROTO=\'none\'|BOOTPROTO=NONE|BOOTPROTO=\"NONE\"|BOOTPROTO=\'NONE\'|BOOTPROTO=static|BOOTPROTO=\"static\"|BOOTPROTO=\'static\'|BOOTPROTO=STATIC|BOOTPROTO=\"STATIC\"|BOOTPROTO=\'STATIC\'" $NetCfgWhole` ]] && Network4Config="isStatic" || Network4Config="isDHCP"
        elif [[ "$3" == "BiStack" ]]; then
          [[ -n `timeout 4s grep -Ewirn "BOOTPROTO=none|BOOTPROTO=\"none\"|BOOTPROTO=\'none\'|BOOTPROTO=NONE|BOOTPROTO=\"NONE\"|BOOTPROTO=\'NONE\'|BOOTPROTO=static|BOOTPROTO=\"static\"|BOOTPROTO=\'static\'|BOOTPROTO=STATIC|BOOTPROTO=\"STATIC\"|BOOTPROTO=\'STATIC\'" $NetCfgWhole` ]] && Network4Config="isStatic" || Network4Config="isDHCP"
          [[ -n `timeout 4s grep -Ewirn "IPV6_AUTOCONF=yes|IPV6_AUTOCONF=\"yes\"|IPV6_AUTOCONF=YES|IPV6_AUTOCONF=\"YES\"|DHCPV6C=yes|DHCPV6C=\"yes\"" $NetCfgWhole` ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        elif [[ "$3" == "IPv6Stack" ]]; then
          Network4Config="isDHCP"
          [[ -n `timeout 4s grep -Ewirn "IPV6_AUTOCONF=yes|IPV6_AUTOCONF=\"yes\"|IPV6_AUTOCONF=YES|IPV6_AUTOCONF=\"YES\"|DHCPV6C=yes|DHCPV6C=\"yes\"" $NetCfgWhole` ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        fi
      elif [[ "$NetCfgFile" =~ "nmconnection" ]]; then
# In NetworkManager for Redhat 9 and later, IPv4 and IPv6 share the same config method and value like the following sample:
#
# [ethernet]
#
# [ipv4]
# method=auto
#
# [ipv6]
# addr-gen-mode=eui64
# method=auto
#
# So we need to import the function "checkIpv4OrIpv6ConfigForRedhat9Later" to confuse.
# which "method=auto or manual" is belonged to [ipv4], which "method=auto or manual" is belonged to [ipv6]. 
        checkIpv4OrIpv6ConfigForRedhat9Later "$NetCfgDir" "$NetCfgFile" "ipv4" "method="
        NetCfg4LineNum="$NetCfgLineNum"
        checkIpv4OrIpv6ConfigForRedhat9Later "$NetCfgDir" "$NetCfgFile" "ipv6" "method="
        NetCfg6LineNum="$NetCfgLineNum"
        if [[ "$3" == "IPv4Stack" ]]; then
          Network6Config="isDHCP"
          [[ `timeout 4s sed -n "$NetCfg4LineNum"p $NetCfgWhole` == "method=auto" ]] && Network4Config="isDHCP" || Network4Config="isStatic"
        elif [[ "$3" == "BiStack" ]]; then
          [[ `timeout 4s sed -n "$NetCfg4LineNum"p $NetCfgWhole` == "method=auto" ]] && Network4Config="isDHCP" || Network4Config="isStatic"
          [[ `timeout 4s sed -n "$NetCfg6LineNum"p $NetCfgWhole` == "method=auto" ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        elif [[ "$3" == "IPv6Stack" ]]; then
          Network4Config="isDHCP"
          [[ `timeout 4s sed -n "$NetCfg6LineNum"p $NetCfgWhole` == "method=auto" ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        fi
      fi
    elif [[ "$1" == 'Debian' ]] || [[ "$1" == 'Kali' ]] || [[ "$1" == 'Ubuntu' ]] || [[ "$1" == 'AlpineLinux' ]]; then
      if [[ "$networkManagerType" == "ifupdown" ]]; then
# Debian network configs may be deposited in the following directions.
# /etc/network/interfaces or /etc/network/interfaces.d/interface or /run/network/interfaces.d/interface
        if [[ "$3" == "IPv4Stack" ]]; then
          Network6Config="isDHCP"
          [[ `timeout 4s grep -iw "iface" $NetCfgWhole | grep -iw "$interface4" | grep -iw "inet" | grep -ic "auto\|dhcp"` -ge "1" ]] && Network4Config="isDHCP" || Network4Config="isStatic"
        elif [[ "$3" == "BiStack" ]]; then
          [[ `timeout 4s grep -iw "iface" $NetCfgWhole | grep -iw "$interface4" | grep -iw "inet" | grep -ic "auto\|dhcp"` -ge "1" ]] && Network4Config="isDHCP" || Network4Config="isStatic"
          [[ `timeout 4s grep -iw "iface" $NetCfgWhole | grep -iw "$interface6" | grep -iw "inet6" | grep -ic "auto\|dhcp"` -ge "1" ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        elif [[ "$3" == "IPv6Stack" ]]; then
          Network4Config="isDHCP"
          [[ `timeout 4s grep -iw "iface" $NetCfgWhole | grep -iw "$interface6" | grep -iw "inet6" | grep -ic "auto\|dhcp"` -ge "1" ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        fi
# Configure method in OVH can't boot with dhcp.
        [[ -n $(timeout 4s grep "accept_ra" $NetCfgWhole) ]] && { Network4Config="isStatic"; Network6Config="isStatic"; }
      elif [[ "$networkManagerType" == "netplan" ]]; then
# For netplan(Ubuntu 18 and later), if network configuration is Static whether IPv4 or IPv6.
# in "*.yaml" config file, dhcp(4 or 6): no or false doesn't exist is allowed.
# But if is DHCP, dhcp(4 or 6): yes or true is necessary.
# Typical format of dhcp status in "*.yaml" is "dhcp4/6: true/false" or "dhcp4/6: yes/no".
# The raw sample processed by function "parseYaml" is: " network_ethernets_enp1s0_dhcp4="true" network_ethernets_enp1s0_dhcp6="true" ".
        [[ ! -z "$NetCfgWhole" ]] && { dhcp4Status=$(parseYaml "$NetCfgWhole" | grep "$interface4" | grep "dhcp"); dhcp6Status=$(parseYaml "$NetCfgWhole" | grep "$interface6" | grep "dhcp"); }
        if [[ "$3" == "IPv4Stack" ]]; then
          Network6Config="isDHCP"
          [[ "$dhcp4Status" =~ "dhcp4=\"true\"" || "$dhcp4Status" =~ "dhcp4=\"yes\"" ]] && Network4Config="isDHCP" || Network4Config="isStatic"
        elif [[ "$3" == "BiStack" ]]; then
          [[ "$dhcp4Status" =~ "dhcp4=\"true\"" || "$dhcp4Status" =~ "dhcp4=\"yes\"" ]] && Network4Config="isDHCP" || Network4Config="isStatic"
          [[ "$dhcp6Status" =~ "dhcp6=\"true\"" || "$dhcp6Status" =~ "dhcp6=\"yes\"" ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        elif [[ "$3" == "IPv6Stack" ]]; then
          Network4Config="isDHCP"
          [[ "$dhcp6Status" =~ "dhcp6=\"true\"" || "$dhcp6Status" =~ "dhcp6=\"yes\"" ]] && Network6Config="isDHCP" || Network6Config="isStatic"
        fi
      fi
    fi
    rm -rf "$tmpNetcfgDir"
  }
  [[ "$Network4Config" == "" ]] && Network4Config="isStatic"
  [[ "$Network6Config" == "" ]] && Network6Config="isStatic"
}

# $1 is "$tmpDHCP", $2 is "$virtWhat".
# For GCP, network config method for netboot kernel must be static. 
function setDhcpOrStatic() {
  [[ "$1" == "dhcp" || "$1" == "auto" || "$1" == "automatic" || "$1" == "true" || "$1" == "yes" || "$1" == "1" ]] && {
    Network4Config="isDHCP"
    Network6Config="isDHCP"
  }
  [[ "$1" == "static" || "$1" == "manual" || "$1" == "none" || "$1" == "false" || "$1" == "no" || "$1" == "0" || -n `echo $2 | grep -io 'google'` ]] && {
    Network4Config="isStatic"
    Network6Config="isStatic"
  }
}

# $1 is "in-target", $2 is "/etc/network/interfaces".
function DebianModifiedPreseed() {
  if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]]; then
# Must use ";" instead of using "&&", "echo -e" etc to combine multiple commands, or write text in files, recommend sed.
# Can't pass parameters correctly in preseed environment.
# DebianVimVer=`ls -a /usr/share/vim | grep vim[0-9]`
    if [[ "$DebianDistNum" -ge "9" && "$DebianDistNum" -le "11" ]]; then
      DebianVimVer="vim"`expr ${DebianDistNum} + 71`
    elif [[ "$DebianDistNum" -ge "12" ]]; then
      DebianVimVer="vim"`expr ${DebianDistNum} + 78`
    elif [[ "$DIST" =~ "kali-" ]]; then
      DebianVimVer="vim90"
    else
      DebianVimVer=""
    fi
# Set parameter "mouse-=a" in /usr/share/vim/vim-version/defaults.vim to support copy text from terminal to client.
    VimSupportCopy="$1 sed -i 's/set mouse=a/set mouse-=a/g' /usr/share/vim/${DebianVimVer}/defaults.vim;"
# Enable cursor edit backspace freely in insert mode.
# Reference: https://wonderwall.hatenablog.com/entry/2016/03/23/232634
    VimIndentEolStart="$1 sed -i 's/set compatible/set nocompatible/g' /etc/vim/vimrc.tiny; $1 sed -i '/set nocompatible/a\set backspace=2' /etc/vim/vimrc.tiny;"
    [[ "$DebianVimVer" == "" ]] && { VimSupportCopy=""; VimIndentEolStart=""; }
# Fail2ban configurations.
# Reference: https://github.com/fail2ban/fail2ban/issues/2756
#            https://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1879390.html
    [[ "$setFail2banStatus" == "1" ]] && { EnableFail2ban="$1 sed -i '/^\[Definition\]/a allowipv6 = auto' /etc/fail2ban/fail2ban.conf; $1 sed -ri 's/^backend = auto/backend = systemd/g' /etc/fail2ban/jail.conf; $1 update-rc.d fail2ban enable; $1 /etc/init.d/fail2ban restart;"; fail2banComponent="fail2ban"; }
    AptUpdating="$1 apt update -y;"
# pre-install some commonly used software.
    InstallComponents="$1 apt install apt-transport-https ca-certificates cron curl dnsutils dpkg ${fail2banComponent} file lrzsz lsb-release net-tools sudo vim wget -y;"
# In Debian 9 and former, some certificates are expired.
    DisableCertExpiredCheck="$1 sed -i '/^mozilla\/DST_Root_CA_X3/s/^/!/' /etc/ca-certificates.conf; $1 update-ca-certificates -f;"
    if [[ "$IsCN" == "cn" ]]; then
# Modify /root/.bashrc to support colorful filename.
      ChangeBashrc="$1 rm -rf /root/.bashrc; $1 wget --no-check-certificate -qO /root/.bashrc 'https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Debian/.bashrc';"
# Need to install "resolvconf" manually after all installation ended, logged into new system.
# DNS server validation must setting up in installed system, can't in preseeding!
# Set China DNS server from Tencent Cloud and Alibaba Cloud permanently.
      [[ "$setDns" == "1" ]] && SetDNS="CNResolvHead" DnsChangePermanently="$1 mkdir -p /etc/resolvconf/resolv.conf.d/; $1 wget --no-check-certificate -qO /etc/resolvconf/resolv.conf.d/head 'https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Debian/network/${SetDNS}';" || DnsChangePermanently=""
# Modify logging in welcome information(Message Of The Day) of Debian and make it more pretty.
      [[ "$setMotd" == "1" ]] && ModifyMOTD="$1 rm -rf /etc/update-motd.d/ /etc/motd /run/motd.dynamic; $1 mkdir -p /etc/update-motd.d/; $1 wget --no-check-certificate -qO /etc/update-motd.d/00-header 'https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Debian/updatemotd/00-header'; $1 wget --no-check-certificate -qO /etc/update-motd.d/10-sysinfo 'https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Debian/updatemotd/10-sysinfo'; $1 wget --no-check-certificate -qO /etc/update-motd.d/90-footer 'https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Debian/updatemotd/90-footer'; $1 chmod +x /etc/update-motd.d/00-header; $1 chmod +x /etc/update-motd.d/10-sysinfo; $1 chmod +x /etc/update-motd.d/90-footer;" || ModifyMOTD=""
# Change "security.debian.org" to "mirrors.tuna.tsinghua.edu.cn". Reference: https://mirrors.tuna.tsinghua.edu.cn/help/debian/
      ChangeSecurityMirror="$1 sed -i 's/security.debian.org/mirrors.tuna.tsinghua.edu.cn/g' /etc/apt/sources.list;"
    else
      ChangeBashrc="$1 rm -rf /root/.bashrc; $1 wget --no-check-certificate -qO /root/.bashrc 'https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Debian/.bashrc';"
# Set DNS server from Cloudflare and Google permanently.
      [[ "$setDns" == "1" ]] && SetDNS="NomalResolvHead" DnsChangePermanently="$1 mkdir -p /etc/resolvconf/resolv.conf.d/; $1 wget --no-check-certificate -qO /etc/resolvconf/resolv.conf.d/head 'https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Debian/network/${SetDNS}';" || DnsChangePermanently=""
      [[ "$setMotd" == "1" ]] && ModifyMOTD="$1 rm -rf /etc/update-motd.d/ /etc/motd /run/motd.dynamic; $1 mkdir -p /etc/update-motd.d/; $1 wget --no-check-certificate -qO /etc/update-motd.d/00-header 'https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Debian/updatemotd/00-header'; $1 wget --no-check-certificate -qO /etc/update-motd.d/10-sysinfo 'https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Debian/updatemotd/10-sysinfo'; $1 wget --no-check-certificate -qO /etc/update-motd.d/90-footer 'https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Debian/updatemotd/90-footer'; $1 chmod +x /etc/update-motd.d/00-header; $1 chmod +x /etc/update-motd.d/10-sysinfo; $1 chmod +x /etc/update-motd.d/90-footer;" || ModifyMOTD=""
      ChangeSecurityMirror=""
    fi
# For multiple interfaces environment, if the interface which is configurated by "auto", regardless of it is plugged by internet cable, 
# Debian/Kali will continuously try to wake and start up it contains with dhcp even timeout.
# Set up with "allow-hotplug(default setting by Debian/Kali installer)" will skip this problem, but if one interface has more than 1 IP or it will connect to
# another network bridge, when system restarted, the interfaces' initialization will be failed, in most of VPS environments, the interfaces of machine should be stable,
# so replace the default from "allow-hotplug" to "auto" for interfaces config method is a better idea?
    [[ "$autoPlugAdapter" == "1" ]] && AutoPlugInterfaces="$1 sed -ri \"s/allow-hotplug $interface4/auto $interface4/g\" $2; $1 sed -ri \"s/allow-hotplug $interface6/auto $interface6/g\" $2;" || AutoPlugInterfaces=""
# If the network config type of server is DHCP and it have both public IPv4 and IPv6 address,
# Debian install program even get nerwork config with DHCP, but after log into new system,
# only the IPv4 of the server has been configurated.
# so need to write "iface interface inet6 dhcp" to /etc/network/interfaces in preseeding process for Bi-stack machine,
# to avoid config IPv6 manually after log into new system.
    SupportIPv6orIPv4=""
    ReplaceActualIpPrefix=""
    if [[ "$IPStackType" == "IPv4Stack" ]]; then
      [[ "$BurnIrregularIpv4Status" == "1" ]] && BurnIrregularIpv4Gate="$1 sed -i '\$a\\\tgateway $actualIp4Gate' $2;"
# This IPv4Stack machine should be setting as IPv4 network accessing priority.
      SupportIPv6orIPv4="$1 sed -i '\$aprecedence ::ffff:0:0/96' /etc/gai.conf;"
      ReplaceActualIpPrefix="$1 sed -ri \"s/address $ipAddr\/$ipPrefix/address $ipAddr\/$actualIp4Prefix/g\" $2;"
      [[ "$iAddrNum" -ge "2" ]] && { writeMultipleIpv4Addresses "$iAddrNum" "$1" ''$2''; SupportIPv6orIPv4="$SupportMultipleIPv4"; }
    elif [[ "$IPStackType" == "BiStack" ]]; then
# Enable IPv4 dhcp or static configurations.
      if [[ "$BiStackPreferIpv6Status" == "1" ]]; then
        if [[ "$Network4Config" == "isDHCP" ]]; then
          SupportIPv6orIPv4="$1 sed -i '\$aiface $interface inet dhcp' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          [[ -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]] && SupportIPv6orIPv4="$1 sed -i '\$a\ ' $2; $1 sed -i '\$aallow-hotplug $interface4' $2; $1 sed -i '\$aiface $interface4 inet dhcp' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          ReplaceActualIpPrefix="$1 sed -ri \"s/address $ip6Addr\/$ip6Mask/address $ip6Addr\/$actualIp6Prefix/g\" $2;"
        elif [[ "$Network4Config" == "isStatic" ]]; then
          SupportIPv6orIPv4="$1 sed -i '\$aiface $interface inet static' $2; $1 sed -i '\$a\\\taddress $ipAddr' $2; $1 sed -i '\$a\\\tnetmask $MASK' $2; $1 sed -i '\$a\\\tgateway $GATE' $2; $1 sed -i '\$a\\\tdns-nameservers $ipDNS' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          [[ -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]] && SupportIPv6orIPv4="$1 sed -i '\$a\ ' $2; $1 sed -i '\$aallow-hotplug $interface4' $2; $1 sed -i '\$aiface $interface4 inet static' $2; $1 sed -i '\$a\\\taddress $ipAddr' $2; $1 sed -i '\$a\\\tnetmask $MASK' $2; $1 sed -i '\$a\\\tgateway $GATE' $2; $1 sed -i '\$a\\\tdns-nameservers $ipDNS' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          ReplaceActualIpPrefix="$1 sed -ri \"s/address $ip6Addr\/$ip6Mask/address $ip6Addr\/$actualIp6Prefix/g\" $2; $1 sed -ri \"s/netmask $MASK/netmask $actualIp4Subnet/g\" $2;"
        fi
      else
        [[ "$BurnIrregularIpv4Status" == "1" ]] && BurnIrregularIpv4Gate="$1 sed -i '\$a\\\tgateway $actualIp4Gate' $2;"
        if [[ "$Network6Config" == "isDHCP" ]]; then
# Enable IPv6 dhcp and set prefer IPv6 access for BiStack or IPv6Stack machine: add "label 2002::/16", "label 2001:0::/32" in last line of the "/etc/gai.conf"
          SupportIPv6orIPv4="$1 sed -i '\$aiface $interface inet6 dhcp' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          [[ -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]] && SupportIPv6orIPv4="$1 sed -i '\$a\ ' $2; $1 sed -i '\$aallow-hotplug $interface6' $2; $1 sed -i '\$aiface $interface6 inet6 dhcp' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          ReplaceActualIpPrefix="$1 sed -ri \"s/address $ipAddr\/$ipPrefix/address $ipAddr\/$actualIp4Prefix/g\" $2;"
        elif [[ "$Network6Config" == "isStatic" ]]; then
          SupportIPv6orIPv4="$1 sed -i '\$aiface $interface inet6 static' $2; $1 sed -i '\$a\\\taddress $ip6Addr' $2; $1 sed -i '\$a\\\tnetmask $ip6Mask' $2; $1 sed -i '\$a\\\tgateway $ip6Gate' $2; $1 sed -i '\$a\\\tdns-nameservers $ip6DNS' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          [[ -n "$interface4" && -n "$interface6" && "$interface4" != "$interface6" ]] && SupportIPv6orIPv4="$1 sed -i '\$a\ ' $2; $1 sed -i '\$aallow-hotplug $interface6' $2; $1 sed -i '\$aiface $interface6 inet6 static' $2; $1 sed -i '\$a\\\taddress $ip6Addr' $2; $1 sed -i '\$a\\\tnetmask $ip6Mask' $2; $1 sed -i '\$a\\\tgateway $ip6Gate' $2; $1 sed -i '\$a\\\tdns-nameservers $ip6DNS' $2; $1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
          ReplaceActualIpPrefix="$1 sed -ri \"s/address $ipAddr\/$ipPrefix/address $ipAddr\/$actualIp4Prefix/g\" $2; $1 sed -ri \"s/netmask $ip6Mask/netmask $actualIp6Prefix/g\" $2;"
        fi
      fi
      [[ "$iAddrNum" -ge "2" || "$i6AddrNum" -ge "2" ]] && { writeMultipleIpv4Addresses "$iAddrNum" "$1" ''$2''; writeMultipleIpv6Addresses "$i6AddrNum" "$1" ''$2''; SupportIPv6orIPv4="$SupportMultipleIPv4 $SupportMultipleIPv6"; }
    elif [[ "$IPStackType" == "IPv6Stack" ]]; then
      [[ "$BurnIrregularIpv6Status" == "1" ]] && BurnIrregularIpv6Gate="$1 sed -i '\$a\\\tgateway $ip6Gate' $2;"
# This IPv6Stack machine should be setting as IPv6 network accessing priority.
      SupportIPv6orIPv4="$1 sed -i '\$alabel 2002::/16' /etc/gai.conf; $1 sed -i '\$alabel 2001:0::/32' /etc/gai.conf;"
      ReplaceActualIpPrefix="$1 sed -ri \"s/address $ip6Addr\/$ip6Mask/address $ip6Addr\/$actualIp6Prefix/g\" $2;"
      [[ "$i6AddrNum" -ge "2" ]] && { writeMultipleIpv6Addresses "$i6AddrNum" "$1" ''$2''; SupportIPv6orIPv4="$SupportMultipleIPv6"; }
    fi
# a typical network configuration sample of IPv6 static for Debian:
# iface eth0 inet static
#         address 10.0.0.72
#         netmask 255.255.255.0
#         gateway 10.0.0.1
#         dns-nameservers 1.0.0.1 8.4.4.8
#
# a typical network configuration sample of IPv6 static for Debian:
# iface eth0 inet6 static
#         address 2702:b43c:492a:9d1e:8270:fd59:6de4:20f1
#         netmask 128
#         gateway fe80::200:17ff:fe9e:f9d0
#         dns-nameservers 2606:4700:4700::1001 2001:4860:4860::8844
    [[ "$linux_relese" == 'kali' ]] && {
      ChangeBashrc=""
# Enable Kali ssh service.
      EnableSSH="$1 update-rc.d ssh enable; $1 /etc/init.d/ssh restart;"
# Revise terms of license from "Debian" to "Kali" in motd file of "00-header".
      ReviseMOTD="$1 sed -ri 's/Debian/Kali/g' /etc/update-motd.d/00-header;"
      SupportZSH="$1 apt install zsh -y; $1 chsh -s /bin/zsh; $1 rm -rf /root/.bashrc.original;"
    }
# For some cloud providers which servers boot from their own grub2 bootloader first by force, not boot from grub in harddisk of our own servers directly,
# we need to creat a soft link for grub2 from grub1 to make sure the first reboot after installation won't meet a fatal.
# In this situation, the partition table and filesystem of the newly installed OS must be "mbr" and "ext4".
# This case has been occurred in these cloud providers such as "app.cloudcone.com", "www.readyidc.com".
    CreateSoftLinkToGrub2FromGrub1="$1 ln -s /boot/grub/ /boot/grub2;"
# Statement of "grub-pc/timeout" in "preseed.cfg" is only valid for BIOS.
    [[ "$EfiSupport" == "enabled" ]] && SetGrubTimeout="$1 sed -ri 's/GRUB_TIMEOUT=5/GRUB_TIMEOUT=3/g' /etc/default/grub; $1 sed -ri 's/set timeout=5/set timeout=3/g' /boot/grub/grub.cfg;" || SetGrubTimeout=""
    export DebianModifiedProcession="${AptUpdating} ${InstallComponents} ${DisableCertExpiredCheck} ${ChangeBashrc} ${VimSupportCopy} ${VimIndentEolStart} ${DnsChangePermanently} ${ModifyMOTD} ${ChangeSecurityMirror} ${BurnIrregularIpv4Gate} ${BurnIrregularIpv6Gate} ${SupportIPv6orIPv4} ${ReplaceActualIpPrefix} ${AutoPlugInterfaces} ${EnableSSH} ${ReviseMOTD} ${SupportZSH} ${EnableFail2ban} ${CreateSoftLinkToGrub2FromGrub1} ${SetGrubTimeout}"
  fi
}

function DebianPreseedProcess() {
  if [[ "$setAutoConfig" == "1" ]]; then
# Debian linux cloud kernel only include drivers of network adapter can reduce resource usage for most virtual servers.
# If target system need to set a raid recipe, to make sure to support more disk controllers, cloud kernel should not be installed.
# Reference: https://docs.software-univention.de/installation-4.4.pdf
#            https://unix.stackexchange.com/questions/639608/difference-between-debians-linux-image-cloud-amd64-and-linux-image-amd64
    addCloudKernelCmd="d-i base-installer/kernel/image string"
    if [[ "$setCloudKernel" == "" ]]; then
      [[ -n "$virtWhat" ]] && {
        [[ "$linux_relese" == 'debian' && "$DebianDistNum" -ge "11" || "$linux_relese" == 'kali' ]] && AddCloudKernel="$addCloudKernelCmd linux-image-cloud-$VER" || AddCloudKernel=""
      }
    elif [[ "$setCloudKernel" == "1" ]]; then
      [[ "$linux_relese" == 'debian' && "$DebianDistNum" -ge "11" || "$linux_relese" == 'kali' ]] && AddCloudKernel="$addCloudKernelCmd linux-image-cloud-$VER" || AddCloudKernel=""
    fi
# Despite VMware and Virtualbox are some kinds of virtualizations but Cloud kernel isn't suitable for them otherwise Debian series will meet a fatal when booting into the newly installed system.
    [[ -n "$setRaid" || "$ddMode" == '1' || -n `echo $virtWhat | grep -io 'vmware\|virtualbox'` ]] && AddCloudKernel=""
    ddWindowsEarlyCommandsOfAnna='anna-install libfuse2-udeb fuse-udeb ntfs-3g-udeb libcrypto3-udeb libpcre2-8-0-udeb libssl3-udeb libuuid1-udeb zlib1g-udeb wget-udeb'
    tmpDdWinsEarlyCommandsOfAnna="$ddWindowsEarlyCommandsOfAnna"
# Default to make a GPT partition to support 3TB hard drive or larger.
# To remove LVM VGM PVM force automatically:
# https://serverfault.com/questions/571363/unable-to-automatically-remove-lvm-data
# To part all disks:
# https://unix.stackexchange.com/questions/341253/using-d-i-partman-recipe-strings
    if [[ "$disksNum" -gt "1" && "$setDisk" == "all" ]]; then
      [[ "$partitionTable" == "gpt" ]] && FormatDisk=`echo -e "d-i partman-auto/disk string $AllDisks\nd-i partman-auto/method string regular\nd-i partman-auto/init_automatically_partition select Guided - use entire disk\nd-i partman-auto/choose_recipe select All files in one partition (recommended for new users)\nd-i partman-basicfilesystems/choose_label string gpt\nd-i partman-basicfilesystems/default_label string gpt\nd-i partman-partitioning/choose_label string gpt\nd-i partman-partitioning/default_label string gpt\nd-i partman/choose_label string gpt\nd-i partman/default_label string gpt"` || FormatDisk=`echo -e "d-i partman-auto/disk string $AllDisks\nd-i partman-auto/method string regular\nd-i partman-auto/init_automatically_partition select Guided - use entire disk\nd-i partman-auto/choose_recipe select All files in one partition (recommended for new users)"`
      PartmanEarlyCommand='debconf-set partman-auto/disk '${AllDisks}';'
    else
      [[ "$partitionTable" == "gpt" ]] && FormatDisk=`echo -e "d-i partman-auto/disk string $IncDisk\nd-i partman-auto/method string regular\nd-i partman-auto/init_automatically_partition select Guided - use entire disk\nd-i partman-auto/choose_recipe select All files in one partition (recommended for new users)\nd-i partman-basicfilesystems/choose_label string gpt\nd-i partman-basicfilesystems/default_label string gpt\nd-i partman-partitioning/choose_label string gpt\nd-i partman-partitioning/default_label string gpt\nd-i partman/choose_label string gpt\nd-i partman/default_label string gpt"` || FormatDisk=`echo -e "d-i partman-auto/disk string $IncDisk\nd-i partman-auto/method string regular\nd-i partman-auto/init_automatically_partition select Guided - use entire disk\nd-i partman-auto/choose_recipe select All files in one partition (recommended for new users)"`
      PartmanEarlyCommand='debconf-set partman-auto/disk "$(list-devices disk | grep '${IncDisk}' | head -n 1)";'
    fi
# Default single disk format recipe( -partition="gpt" ):
# d-i partman-auto/disk string $AllDisks/$IncDisk
# d-i partman-auto/method string regular
# d-i partman-auto/init_automatically_partition select Guided - use entire disk
# d-i partman-auto/choose_recipe select All files in one partition (recommended for new users)
# d-i partman-basicfilesystems/choose_label string gpt
# d-i partman-basicfilesystems/default_label string gpt
# d-i partman-partitioning/choose_label string gpt
# d-i partman-partitioning/default_label string gpt
# d-i partman/choose_label string gpt
# d-i partman/default_label string gpt
    setRaidRecipe "$setRaid" "$disksNum" "$AllDisks" "$linux_relese"
# Debian 11 and former versions couldn't accept irregular IPv6 format configs, they can only be recognized by Debian 12+ and Kali, dd mode(base system is Debian 12) prefer IPv4 to config network.
    if [[ "$BiStackPreferIpv6Status" == "1" ]]; then
      if [[ "$interfacesNum" -ge "2" ]] || [[ "$linux_relese" == 'debian' && "$DebianDistNum" -le "11" ]] || [[ "$ddMode" == '1' ]]; then
        BiStackPreferIpv6Status=""
        BurnIrregularIpv6Status=""
        BurnIrregularIpv4Status='1'
        interfaceSelect="$interface4"
      fi
    fi
# A valid method to add an irregular gateway by force:
# This method aims to hack IPv4 network service and add IPv4 route by force in busybox, so we need to assign "none" for "d-i netcfg/get_gateway string" to avoid Debian installer report "unreachable gateway",
# don't forget to write IPv4 gateway back in "d-i preseed/late_command" stage.
# Reference: https://lab.civicrm.org/infra/ops/blob/master/ansible/roles/kvm-server/templates/etc/preseeds/host/preseed.cfg
#
# Reserved empty variables for engineering debugging, if you are not known them well, don't uncomment with them!
    # BurnIrregularIpv4Status='1'
    # ipPrefix=""
    # MASK=""
    [[ Network4Config == "isDHCP" ]] && BurnIrregularIpv4Status='0'
    [[ "$BurnIrregularIpv4Status" == "1" ]] && {
      actualIp4Gate="$GATE"
      GATE="none"
      if [[ "$IPStackType" == "IPv4Stack" ]]; then
        writeDnsByForce='echo '\''nameserver '$ipDNS1''\'' > /etc/resolv.conf && echo '\''nameserver '$ipDNS2''\'' >> /etc/resolv.conf'
      elif [[ "$IPStackType" == "BiStack" ]]; then
        writeDnsByForce='echo '\''nameserver '$ipDNS1''\'' > /etc/resolv.conf && echo '\''nameserver '$ip6DNS1''\'' >> /etc/resolv.conf && echo '\''nameserver '$ipDNS2''\'' >> /etc/resolv.conf && echo '\''nameserver '$ip6DNS2''\'' >> /etc/resolv.conf'
      fi
# If subnet of some machines of IPv4 config is "32"(255.255.255.255) means the intranet range is smallest, just including the server itself,
# the "onlink" must be included in command of adding gateway(route) by force via soft hack, for example:
#
# ip route add default via 10.0.0.1 dev eth0 onlink
#
# to tell the networking service that the gateway of "10.0.0.1" will serve the device of network adapter "eth0" via "onlink" by IPv4 stack protocol
# because "onlink" stipulates networking to establish a connection from local to gateway by "arp" directly without creating any area of intranet.
      [[ "$ddMode" == '0' ]] && tmpDdWinsEarlyCommandsOfAnna=''
      BurnIrregularIpv4ByForce=`echo -e 'd-i preseed/early_command string ip link set dev '$interface4' up; ip addr add '$IPv4'/'$ipPrefix' dev '$interface4'; echo "(ip route add '$actualIp4Gate' dev '$interface4' || true) && (ip route add default via '$actualIp4Gate' dev '$interface4' onlink || true) && '$writeDnsByForce'" > /bin/ethdetect; echo "(test -x /bin/ethdetect && /bin/ethdetect) || true" >> /usr/share/debconf/confmodule; '$tmpDdWinsEarlyCommandsOfAnna''`
    }
# Prefer to use IPv4 stack to config networking.
    if [[ "$IPStackType" == "IPv4Stack" ]] || [[ "$IPStackType" == "BiStack" && "$BiStackPreferIpv6Status" != "1" ]]; then
      [[ "$Network4Config" == "isStatic" ]] && NetConfigManually=`echo -e "d-i netcfg/disable_autoconfig boolean true\nd-i netcfg/dhcp_failed note\nd-i netcfg/dhcp_options select Configure network manually\nd-i netcfg/get_ipaddress string $IPv4\nd-i netcfg/get_netmask string $MASK\nd-i netcfg/get_gateway string $GATE\nd-i netcfg/get_nameservers string $ipDNS\nd-i netcfg/no_default_route boolean true\nd-i netcfg/confirm_static boolean true"` || NetConfigManually=""
# Prefer to use IPv6 stack to configure network because Debian 12 supports public IPv6 address with private gateway like "fe80::1" and works well,
# if IPv4 configuration of one BiStack server has public IPv4 and private gateway like "172.31.1.1" because this case will cause Debian installer notices "unreachable gateway".
    elif [[ "$IPStackType" == "IPv6Stack" ]] || [[ "$IPStackType" == "BiStack" && "$BiStackPreferIpv6Status" == "1" ]]; then
      [[ "$Network6Config" == "isStatic" ]] && NetConfigManually=`echo -e "d-i netcfg/disable_autoconfig boolean true\nd-i netcfg/dhcp_failed note\nd-i netcfg/dhcp_options select Configure network manually\nd-i netcfg/get_ipaddress string $ip6Addr\nd-i netcfg/get_netmask string $ip6Subnet\nd-i netcfg/get_gateway string $ip6Gate\nd-i netcfg/get_nameservers string $ip6DNS\nd-i netcfg/no_default_route boolean true\nd-i netcfg/confirm_static boolean true"` || NetConfigManually=""
    fi
# The similar principle as hacking IPv4.
    [[ "$BurnIrregularIpv6Status" == "1" ]] && {
      writeDnsByForce='echo '\''nameserver '$ip6DNS1''\'' > /etc/resolv.conf && echo '\''nameserver '$ip6DNS2''\'' >> /etc/resolv.conf'
      BurnIrregularIpv6ByForce=`echo -e 'd-i preseed/early_command string ip link set dev '$interface6' up; ip -6 addr add '$ip6Addr'/'$actualIp6Prefix' dev '$interface6'; echo "(ip -6 route add '$ip6Gate' dev '$interface6' || true) && (ip -6 route add default via '$ip6Gate' dev '$interface6' onlink || true) && '$writeDnsByForce'" > /bin/ethdetect; echo "(test -x /bin/ethdetect && /bin/ethdetect) || true" >> /usr/share/debconf/confmodule;'`
      NetConfigManually=`echo -e "d-i netcfg/disable_autoconfig boolean true\nd-i netcfg/dhcp_failed note\nd-i netcfg/dhcp_options select Configure network manually\nd-i netcfg/get_ipaddress string $ip6Addr\nd-i netcfg/get_netmask string $ip6Subnet\nd-i netcfg/get_gateway string none\nd-i netcfg/get_nameservers string $ip6DNS\nd-i netcfg/no_default_route boolean true\nd-i netcfg/confirm_static boolean true"`
    }
# Debian installer can only identify the full IPv6 address of IPv6 mask,
# so we need to covert IPv6 prefix shortening from "0-128" to whole IPv6 address.
# The result of "$ip6Subnet" is calculated by function "ipv6SubnetCalc".
# 
# Manually network setting configurations, including:
# d-i netcfg/disable_autoconfig boolean true
# d-i netcfg/dhcp_failed note
# d-i netcfg/dhcp_options select Configure network manually
# d-i netcfg/get_ipaddress string $IPv4/$ip6Addr
# d-i netcfg/get_netmask string $MASK/$ip6Subnet
# d-i netcfg/get_gateway string $GATE/$ip6Gate
# d-i netcfg/get_nameservers string $ipDNS/$ip6DNS
# d-i netcfg/no_default_route boolean true
# d-i netcfg/confirm_static boolean true
    DebianModifiedPreseed "in-target" "/etc/network/interfaces"
    cat >/tmp/boot/preseed.cfg<<EOF
### Unattended Installation
d-i auto-install/enable boolean true
d-i debconf/priority select critical

### Localization
d-i debian-installer/locale string en_US.UTF-8
d-i debian-installer/country string US
d-i debian-installer/language string en
d-i debian-installer/allow_unauthenticated boolean true
d-i console-setup/layoutcode string us
d-i keyboard-configuration/xkb-keymap string us

### Low memory mode
d-i lowmem/low note

### Disable security, updates and backports
d-i apt-setup/services-select multiselect

### Disable source repositories
d-i apt-setup/enable-source-repositories boolean false

### Enable contrib, non-free and non-free firmware
d-i apt-setup/contrib boolean true
d-i apt-setup/non-free boolean true
d-i apt-setup/non-free-firmware boolean true

### Disable CD-rom automatic scan
d-i apt-setup/cdrom/set-first boolean false
d-i apt-setup/cdrom/set-next boolean false
d-i apt-setup/cdrom/set-failed boolean false

### Configure cloud kernel
${AddCloudKernel}

### Network configuration
d-i netcfg/choose_interface select $interfaceSelect
${NetConfigManually}
d-i hw-detect/load_firmware boolean true
${BurnIrregularIpv4ByForce}
${BurnIrregularIpv6ByForce}

### Mirror settings
d-i mirror/country string manual
d-i mirror/http/hostname string $MirrorHost
d-i mirror/http/directory string $MirrorFolder
d-i mirror/http/proxy string

### Account setup
d-i passwd/root-login boolean ture
d-i passwd/make-user boolean false
d-i passwd/root-password-crypted password ${myPASSWORD}
d-i user-setup/allow-password-weak boolean true
d-i user-setup/encrypt-home boolean false

### Clock and time zone setup
d-i clock-setup/utc boolean true
d-i time/zone string ${TimeZone}
d-i clock-setup/ntp boolean true
d-i clock-setup/ntp-server string ntp.nict.jp

### Get harddisk name and Windows DD installation set up
d-i preseed/early_command string ${ddWindowsEarlyCommandsOfAnna}
d-i partman/early_command string \
lvremove --select all -ff -y; \
vgremove --select all -ff -y; \
pvremove /dev/* -ff -y; \
[[ -n "\$(blkid -t TYPE='vfat' -o device)" ]] && umount "\$(blkid -t TYPE='vfat' -o device)"; \
${PartmanEarlyCommand} \
wget -qO- '$DDURL' | $DEC_CMD | /bin/dd of=\$(list-devices disk | grep ${IncDisk} | head -n 1); \
/bin/ntfs-3g \$(list-devices partition | grep ${IncDisk} | head -n 1) /mnt; \
cd '/mnt/ProgramData/Microsoft/Windows/Start Menu/Programs'; \
cd Start* || cd start*; \
cp -f '/net.bat' './net.bat'; \
/sbin/reboot; \
umount /media || true; \

### Partitioning
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-lvm/device_remove_lvm_span boolean true
d-i partman-lvm/confirm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true
d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true
d-i partman/default_filesystem string ext4
d-i partman/mount_style select uuid
d-i partman-md/device_remove_md boolean true
${FormatDisk}

### Package selection
tasksel tasksel/first multiselect minimal
d-i pkgsel/include string openssh-server

# Automatic updates are not applied, everything is updated manually.
d-i pkgsel/update-policy select none
d-i pkgsel/upgrade select none

### Disable to upload developer statistics anonymously
popularity-contest popularity-contest/participate boolean false

### Grub
d-i grub-installer/only_debian boolean true
d-i grub-installer/with_other_os boolean true
d-i grub-installer/bootdev string ${IncDisk}
d-i grub-installer/force-efi-extra-removable boolean true
d-i debian-installer/add-kernel-opts string net.ifnames=0 biosdevname=0 ipv6.disable=1
grub-pc grub-pc/hidden_timeout boolean false
grub-pc grub-pc/timeout string 3

### Shutdown machine
d-i finish-install/reboot_in_progress note
d-i debian-installer/exit/reboot boolean true

### Write preseed
d-i preseed/late_command string	\
sed -ri 's/^#?Port.*/Port ${sshPORT}/g' /target/etc/ssh/sshd_config; \
sed -ri 's/^#?PermitRootLogin.*/PermitRootLogin yes/g' /target/etc/ssh/sshd_config; \
sed -ri 's/^#?PasswordAuthentication.*/PasswordAuthentication yes/g' /target/etc/ssh/sshd_config; \
echo '@reboot root cat /etc/run.sh 2>/dev/null |base64 -d >/tmp/run.sh; rm -rf /etc/run.sh; sed -i /^@reboot/d /etc/crontab; bash /tmp/run.sh' >>/target/etc/crontab; \
echo '' >>/target/etc/crontab; \
echo '${setCMD}' >/target/etc/run.sh; \
${DebianModifiedProcession}
EOF
  fi
}

alpineInstallOrDdAdditionalFiles() {
  AlpineInitFile="$1"
  AlpineDnsFile="$2"
  AlpineMotd="$3"
  AlpineInitFileName="alpineConf.start"
  if [[ "$targetRelese" == 'Ubuntu' ]]; then
    if [[ "$ubuntuVER" == "amd64" ]]; then
      targetLinuxMirror="$4"
    elif [[ "$ubuntuVER" == "arm64" ]]; then
      targetLinuxMirror="$5"
    fi
    AlpineInitFile="$6"
    AlpineInitFileName="ubuntuConf.start"
    [[ "$setIPv6" == "0" ]] && setIPv6="0" || setIPv6="1"
  elif [[ "$targetRelese" == 'Windows' ]]; then
    AlpineInitFile="$7"
    AlpineInitFileName="windowsConf.start"
    windowsStaticConfigCmd="$8"
  fi
}

# $1 is "$tmpURL".
verifyUrlValidationOfDdImages() {
  echo "$1" | grep -q '^http://\|^ftp://\|^https://'
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Please input a vaild URL, only support http://, ftp:// and https:// ! \n" && exit 1
  tmpURLCheck=$(echo $(curl -s -I -X GET $1) | grep -wi "http/[0-9]*" | awk '{print $2}')
  [[ -z "$tmpURLCheck" || ! "$tmpURLCheck" =~ ^[0-9]+$ ]] && {
    echo -ne "\n[${red}Error${plain}] The mirror of DD images is temporarily unavailable!\n"
    exit 1
  }
  DDURL="$1"
# Decompress command selection
  if [[ "$setFileType" == "gz" ]]; then
    DEC_CMD="gunzip -dc"
    [[ $(echo "$DDURL" | grep -o ...$) == ".xz" ]] && DEC_CMD="xzcat"
  elif [[ "$setFileType" == "xz" ]]; then
    DEC_CMD="xzcat"
    [[ $(echo "$DDURL" | grep -o ...$) == ".gz" ]] && DEC_CMD="gunzip -dc"
  else
    [[ $(echo "$DDURL" | grep -o ...$) == ".xz" ]] && DEC_CMD="xzcat"
    [[ $(echo "$DDURL" | grep -o ...$) == ".gz" ]] && DEC_CMD="gunzip -dc"
  fi
}

checkSys

# Get the name of network adapter($interface).
# [[ -z "$interface" ]] && interface=`getInterface "$CurrentOS"
# Try to enable IPv4 by DHCP
# timeout 5 dhclient -4 $interface
# Try to enable IPv6 by DHCP
# timeout 5 dhclient -6 $interface

# IPv4 and IPv6 DNS check servers from OpenDNS, Quad9, Verisign and TWNIC.
checkIpv4OrIpv6 "$ipAddr" "$ip6Addr" "208.67.220.220" "9.9.9.9" "64.6.65.6" "101.102.103.104" "2620:0:ccc::2" "2620:fe::9" "2620:74:1b::1:1" "2001:de4::101"

# Youtube, Instagram, Wikipedia and BBC are all have public IPv4 and IPv6 address and are also banned in mainland of China.
checkCN "$IPStackType" "www.youtube.com" "www.instagram.com" "www.wikipedia.org" "bbc.com"

checkEfi "/sys/firmware/efi/efivars/" "/sys/firmware/efi/vars/" "/sys/firmware/efi/runtime-map/" "/sys/firmware/efi/mok-variables/"

checkVirt

if [[ "$sshPORT" ]];then
  if [[ ! ${sshPORT} -ge "1" ]] || [[ ! ${sshPORT} -le "65535" ]] || [[ `grep '^[[:digit:]]*$' <<< '${sshPORT}'` ]]; then
    sshPORT='22'
  fi
else
  sshPORT=$(grep -Ei "^port|^#port" /etc/ssh/sshd_config | head -n 1 | awk -F' ' '{print $2}')
  [[ "$sshPORT" == "" ]] && sshPORT=$(netstat -anp | grep -i 'sshd: root' | grep -iw 'tcp' | awk '{print $4}' | head -n 1 | cut -d':' -f'2')
  [[ "$sshPORT" == "" ]] && sshPORT=$(netstat -anp | grep -i 'sshd: root' | grep -iw 'tcp6' | awk '{print $4}' | head -n 1 | awk -F':' '{print $NF}')
  if [[ "$sshPORT" == "" ]] || [[ ! ${sshPORT} -ge "1" ]] || [[ ! ${sshPORT} -le "65535" ]] || [[ `grep '^[[:digit:]]*$' <<< '${sshPORT}'` ]]; then
    sshPORT='22'
  fi
fi

# Disable SELinux
[[ -f /etc/selinux/config ]] && {
  SELinuxStatus=$(sestatus -v | grep "SELinux status:" | grep enabled)
  [[ "$SELinuxStatus" != "" ]] && echo -ne "\n${aoiBlue}# Disabled SELinux${plain}" && setenforce 0
}

[[ ! -d "/tmp/" ]] && mkdir /tmp

if [[ "$loaderMode" == "0" ]]; then
  checkGrub "/boot/grub/" "/boot/grub2/" "/etc/" "grub.cfg" "grub.conf" "/boot/efi/EFI/"
  if [[ -z "$GRUBTYPE" ]]; then
    echo -ne "\n[${red}Error${plain}] Not Found grub.\n"
    exit 1
  fi
fi

[[ "$ddMode" == '1' ]] && {
  if [[ "$targetRelese" == 'Ubuntu' ]] || [[ "$targetRelese" == 'Windows' ]]; then
    Relese='AlpineLinux'
    tmpDIST='edge'
    if [[ "$targetRelese" == 'Windows' ]]; then
      [[ "$VER" == "aarch64" || "$VER" == "arm64" ]] && {
        echo -ne "\n[${red}Error${plain}] ${targetRelese} doesn't support ${VER} architecture.\n"
        exit 1
      }
    fi
  else
    Relese='Debian'
    tmpDIST='12'
  fi
}

[[ -n "$Relese" ]] || Relese='Debian'
linux_relese=$(echo "$Relese" |sed 's/\ //g' |sed -r 's/(.*)/\L\1/')

clear && echo -ne "\n${aoiBlue}# Check Dependence${plain}\n\n"

dependence awk,basename,cat,cpio,curl,cut,dig,dirname,file,find,grep,gzip,iconv,ip,lsblk,openssl,sed,wget,xz;

ipDNS1=$(echo $ipDNS | cut -d ' ' -f 1)
ipDNS2=$(echo $ipDNS | cut -d ' ' -f 2)
ip6DNS1=$(echo $ip6DNS | cut -d ' ' -f 1)
ip6DNS2=$(echo $ip6DNS | cut -d ' ' -f 2)
ipDNS=$(checkDNS "$ipDNS")
ip6DNS=$(checkDNS "$ip6DNS")

if [[ -n "$ipAddr" && -n "$ipMask" && -n "$ipGate" ]] && [[ -z "$ip6Addr" && -z "$ip6Mask" && -z "$ip6Gate" ]]; then
  setNet='1'
  checkDHCP "$CurrentOS" "$CurrentOSVer" "$IPStackType"
  setDhcpOrStatic "$tmpDHCP" "$virtWhat"
  Network4Config="isStatic"
  acceptIPv4AndIPv6SubnetValue "$ipMask" ""
  [[ "$IPStackType" != "IPv4Stack" ]] && getIPv6Address
elif [[ -n "$ipAddr" && -n "$ipMask" && -n "$ipGate" ]] && [[ -n "$ip6Addr" && -n "$ip6Mask" && -n "$ip6Gate" ]]; then
  setNet='1'
  [[ -z "$interfaceSelect" ]] && getInterface "$CurrentOS"
  Network4Config="isStatic"
  Network6Config="isStatic"
  acceptIPv4AndIPv6SubnetValue "$ipMask" "$ip6Mask"
elif [[ -z "$ipAddr" && -z "$ipMask" && -z "$ipGate" ]] && [[ -n "$ip6Addr" && -n "$ip6Mask" && -n "$ip6Gate" ]]; then
  setNet='1'
  checkDHCP "$CurrentOS" "$CurrentOSVer" "$IPStackType"
  setDhcpOrStatic "$tmpDHCP" "$virtWhat"
  Network6Config="isStatic"
  acceptIPv4AndIPv6SubnetValue "" "$ip6Mask"
  getIPv4Address
fi

if [[ "$setNet" == "0" ]]; then
  checkDHCP "$CurrentOS" "$CurrentOSVer" "$IPStackType"
  setDhcpOrStatic "$tmpDHCP" "$virtWhat"
  getIPv4Address
  [[ "$IPStackType" != "IPv4Stack" ]] && getIPv6Address
  if [[ "$IPStackType" == "BiStack" && "$iAddrNum" -ge "2" || "$i6AddrNum" -ge "2" ]]; then
    if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]] || [[ "$linux_relese" == 'alpinelinux' ]]; then
      Network4Config="isStatic"
    fi
    [[ "$BiStackPreferIpv6Status" == "1" ]] && {
      BiStackPreferIpv6Status=""
      BurnIrregularIpv6Status=""
      BurnIrregularIpv4Status='1'
    }
  fi
fi

checkWarp "warp*.conf" "wgcf*.conf" "wg[0-9].conf" "warp*" "wgcf*" "wg[0-9]" "privatekey" "publickey"

IPv4="$ipAddr"; MASK="$ipMask"; GATE="$ipGate";
if [[ -z "$IPv4" && -z "$MASK" && -z "$GATE" ]] && [[ -z "$ip6Addr" && -z "$ip6Mask" && -z "$ip6Gate" ]]; then
  echo -ne "\n[${red}Error${plain}] The network of your machine may not be available!\n"
  bash $0 error
  exit 1
fi

echo -ne "\n${aoiBlue}# Network Details${plain}\n"
[[ -n "$interfaceSelect" ]] && echo -ne "\n[${yellow}Adapter Name${plain}]  $interfaceSelect" || echo -ne "\n[${yellow}Adapter Name${plain}]  $interface"
[[ -n "$NetCfgWhole" ]] && echo -ne "\n[${yellow}Network File${plain}]  $NetCfgWhole" || echo -ne "\n[${yellow}Network File${plain}]  N/A"
echo -ne "\n[${yellow}Server Stack${plain}]  $IPStackType\n"
[[ "$IPStackType" != "IPv6Stack" ]] && echo -ne "\n[${yellow}IPv4  Method${plain}]  $Network4Config\n" || echo -ne "\n[${yellow}IPv4  Method${plain}]  N/A\n"
[[ "$IPv4" && "$IPStackType" != "IPv6Stack" ]] && echo -e "[${yellow}IPv4 Address${plain}]  ""$IPv4" || echo -e "[${yellow}IPv4 Address${plain}]  ""N/A"
[[ "$IPv4" && "$IPStackType" != "IPv6Stack" ]] && echo -e "[${yellow}IPv4  Subnet${plain}]  ""$actualIp4Subnet" || echo -e "[${yellow}IPv4  Subnet${plain}]  ""N/A"
[[ "$IPv4" && "$IPStackType" != "IPv6Stack" ]] && echo -e "[${yellow}IPv4 Gateway${plain}]  ""$GATE" || echo -e "[${yellow}IPv4 Gateway${plain}]  ""N/A"
[[ "$IPv4" && "$IPStackType" != "IPv6Stack" ]] && echo -e "[${yellow}IPv4     DNS${plain}]  ""$ipDNS" || echo -e "[${yellow}IPv4     DNS${plain}]  ""N/A"
[[ "$IPStackType" != "IPv4Stack" ]] && echo -ne "\n[${yellow}IPv6  Method${plain}]  $Network6Config\n" || echo -ne "\n[${yellow}IPv6  Method${plain}]  N/A\n"
[[ "$ip6Addr" && "$IPStackType" != "IPv4Stack" ]] && echo -e "[${yellow}IPv6 Address${plain}]  ""$ip6Addr" || echo -e "[${yellow}IPv6 Address${plain}]  ""N/A"
[[ "$ip6Addr" && "$IPStackType" != "IPv4Stack" ]] && echo -e "[${yellow}IPv6  Subnet${plain}]  ""$actualIp6Prefix" || echo -e "[${yellow}IPv6  Subnet${plain}]  ""N/A"
[[ "$ip6Addr" && "$IPStackType" != "IPv4Stack" ]] && echo -e "[${yellow}IPv6 Gateway${plain}]  ""$ip6Gate" || echo -e "[${yellow}IPv6 Gateway${plain}]  ""N/A"
[[ "$ip6Addr" && "$IPStackType" != "IPv4Stack" ]] && echo -e "[${yellow}IPv6     DNS${plain}]  ""$ip6DNS" || echo -e "[${yellow}IPv6     DNS${plain}]  ""N/A"

getUserTimeZone "/root/timezonelists" "https://api.ip.sb/geoip/" "http://ifconfig.co/json?ip=" "http://ip-api.com/json/" "https://ipapi.co/" "YjNhNjAxNjY5YTFiNDI2MmFmOGYxYjJjZDk3ZjNiN2YK" "MmUxMjBhYmM0Y2Q4NDM1ZDhhMmQ5YzQzYzk4ZTZiZTEK" "NjBiMThjZWJlMWU1NGQ5NDg2YWY0MTgyMWM0ZTZiZDgK"
[[ -z "$TimeZone" ]] && TimeZone="Asia/Tokyo"
echo -ne "\n${aoiBlue}# User Timezone${plain}\n\n"
echo "$TimeZone"

if [[ -z "$tmpWORD" || "$linux_relese" == 'alpinelinux' || "$targetRelese" == 'Ubuntu' ]]; then
  tmpWORD='LeitboGi0ro'
  myPASSWORD='$6$qE9Lqgrd0QTOq46i$YMECmKvIw2SeBP4X411I0ZWmtyMsRcBi4Rxu7HYRsqdwqSApi6zjds5UJyM4HrAoBcuLBmjPyLatGydulmCDb0'
else
# "-1" is MD5, "-5" is SHA256, "-6" is SHA512. MD5 is no longer secure.
  myPASSWORD=$(openssl passwd -6 ''$tmpWORD'')
fi

echo -ne "\n${aoiBlue}# SSH or RDP Port, Username and Password${plain}\n\n"
if [[ "$targetRelese" == 'Windows' && "$tmpURL" == "" || "$tmpURL" =~ "dl.lamp.sh" ]]; then
  echo "3389"
  echo "Administrator"
  echo "Teddysun.com"
elif [[ -z "$targetRelese" && "$ddMode" == '1' ]]; then
  echo -e "N/A\nN/A\nN/A"
else
  echo "$sshPORT"
  echo "root"
  echo "$tmpWORD"
fi

setDisk=$(echo "$setDisk" | sed 's/[A-Z]/\l&/g')
getDisk "$setDisk" "$linux_relese"
echo -ne "\n${aoiBlue}# Formatting and Installing Drives${plain}\n\n"
[[ "$setDisk" == "all" || -n "$setRaid" ]] && echo "$AllDisks" || echo "$IncDisk"

echo -ne "\n${aoiBlue}# Motherboard Firmware${plain}\n\n"
[[ "$EfiSupport" == "enabled" ]] && echo "UEFI" || echo "BIOS"

# Get architecture of current os automatically
ArchName=`uname -m`
[[ -z "$ArchName" ]] && ArchName=$(echo `hostnamectl status | grep "Architecture" | cut -d':' -f 2`)
case $ArchName in arm64) VER="arm64";; aarch64) VER="aarch64";; x86|i386|i686) VER="i386";; x86_64) VER="x86_64";; x86-64) VER="x86-64";; amd64) VER="amd64";; *) VER="";; esac
# Exchange architecture name
if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'ubuntu' ]] || [[ "$linux_relese" == 'kali' ]]; then
# In debian 12, the result of "uname -m" is "x86_64";
# the result of "echo `hostnamectl status | grep "Architecture" | cut -d':' -f 2`" is "x86-64"
  if [[ "$VER" == "x86_64" ]] || [[ "$VER" == "x86-64" ]]; then
    VER="amd64"
  elif [[ "$VER" == "aarch64" ]]; then
    VER="arm64"
  fi
elif [[ "$linux_relese" == 'alpinelinux' ]] || [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
  if [[ "$VER" == "amd64" ]] || [[ "$VER" == "x86-64" ]]; then
    VER="x86_64"
  elif [[ "$VER" == "arm64" ]]; then
    VER="aarch64"
  fi
fi

# Check and exchange input architecture name
tmpVER="$(echo "$tmpVER" |sed -r 's/(.*)/\L\1/')"
if [[ -n "$tmpVER" ]]; then
  case "$tmpVER" in
    i386|i686|x86|32)
      VER="i386"
      ;;
    amd64|x86_64|x64|64)
      [[ "$linux_relese" == 'alpinelinux' ]] || [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]] && VER='x86_64' || VER='amd64'
      ;;
    aarch64|arm64|arm)
      [[ "$linux_relese" == 'alpinelinux' ]] || [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]] && VER='aarch64' || VER='arm64'
      ;;
    *)
      VER=''
      ;;
  esac
fi

[[ ! -n "$VER" ]] && {
  echo -ne "\n[${red}Error${plain}] Unknown architecture.\n"
  bash $0 error
  exit 1
}

[[ -z "$tmpDIST" ]] && {
  [ "$Relese" == 'Debian' ] && tmpDIST='12'
  [ "$Relese" == 'Kali' ] && tmpDIST='rolling'
  [ "$Relese" == 'AlpineLinux' ] && tmpDIST='edge'
  [ "$Relese" == 'CentOS' ] && tmpDIST='9'
  [ "$Relese" == 'RockyLinux' ] && tmpDIST='9'
  [ "$Relese" == 'AlmaLinux' ] && tmpDIST='9'
  [ "$Relese" == 'Fedora' ] && tmpDIST='38'
}
[[ -z "$finalDIST" ]] && {
  [ "$targetRelese" == 'Ubuntu' ] && finalDIST='22.04'
  [ "$targetRelese" == 'Windows' ] && finalDIST='server 2022'
}

if [[ -n "$tmpDIST" ]]; then
  if [[ "$Relese" == 'Debian' ]]; then
    SpikCheckDIST='0'
    DIST="$(echo "$tmpDIST" |sed -r 's/(.*)/\L\1/')"
    DebianDistNum="${DIST}"
    echo "$DIST" |grep -q '[0-9]'
    [[ $? -eq '0' ]] && {
      isDigital="$(echo "$DIST" |grep -o '[\.0-9]\{1,\}' |sed -n '1h;1!H;$g;s/\n//g;$p' |cut -d'.' -f1)";
      [[ -n $isDigital ]] && {
        [[ "$isDigital" == '7' ]] && DIST='wheezy'
        [[ "$isDigital" == '8' ]] && DIST='jessie'
        [[ "$isDigital" == '9' ]] && DIST='stretch'
        [[ "$isDigital" == '10' ]] && DIST='buster'
        [[ "$isDigital" == '11' ]] && DIST='bullseye'
        [[ "$isDigital" == '12' ]] && DIST='bookworm'
        [[ "$isDigital" == '13' ]] && DIST='trixie'
        # [[ "$isDigital" == '14' ]] && DIST='forky'
# Debian releases TBA reference: https://wiki.debian.org/DebianReleases
#                                https://en.wikipedia.org/wiki/Debian_version_history#Release_table
      }
    }
    LinuxMirror=$(selectMirror "$Relese" "$DIST" "$VER" "$tmpMirror")
  fi
  if [[ "$Relese" == 'Kali' ]]; then
    SpikCheckDIST='0'
    DIST="$(echo "$tmpDIST" |sed -r 's/(.*)/\L\1/')"
    [[ ! "$DIST" =~ "kali-" ]] && DIST="kali-""$DIST"
# Kali Linux releases reference: https://www.kali.org/releases/
    LinuxMirror=$(selectMirror "$Relese" "$DIST" "$VER" "$tmpMirror")
  fi
  if [[ "$Relese" == 'AlpineLinux' ]]; then
    SpikCheckDIST='0'
    DIST="$(echo "$tmpDIST" |sed -r 's/(.*)/\L\1/')"
# Recommend "edge" version of Alpine Linux to make sure to keep always updating.
    AlpineVer1=`echo "$DIST" | sed 's/[a-z][A-Z]*//g' | cut -d"." -f 1`
    AlpineVer2=`echo "$DIST" | sed 's/[a-z][A-Z]*//g' | cut -d"." -f 2`
    if [[ "$AlpineVer1" -lt "3" || "$AlpineVer2" -le "15" ]] && [[ "$DIST" != "edge" ]]; then
      echo -ne "\n[${red}Warning${plain}] $Relese $DIST is not supported!\n"
      exit 1
    fi
    [[ "$DIST" != "edge" && ! "$DIST" =~ "v" ]] && DIST="v""$DIST"
# Alpine Linux releases reference: https://alpinelinux.org/releases/
    LinuxMirror=$(selectMirror "$Relese" "$DIST" "$VER" "$tmpMirror")
  fi
  if [[ "$Relese" == 'CentOS' ]] || [[ "$Relese" == 'RockyLinux' ]] || [[ "$Relese" == 'AlmaLinux' ]] || [[ "$Relese" == 'Fedora' ]]; then
    SpikCheckDIST='1'
    DISTCheck="$(echo "$tmpDIST" |grep -o '[\.0-9]\{1,\}' |head -n1)"
    RedHatSeries=`echo "$tmpDIST" | cut -d"." -f 1 | cut -d"-" -f 1`
# CentOS and CentOS stream releases history:
# https://endoflife.date/centos
    if [[ "$linux_relese" == 'centos' ]]; then
      [[ "$RedHatSeries" =~ [0-9]{${#1}} ]] && {
        if [[ "$RedHatSeries" == "6" ]]; then
          DISTCheck="6.10"
          echo -ne "\n[${red}Warning${plain}] $Relese $DISTCheck is not supported!\n"
          exit 1
        elif [[ "$RedHatSeries" == "7" ]]; then
          DISTCheck="7.9.2009"
        elif [[ "$RedHatSeries" -ge "8" ]] && [[ ! "$RedHatSeries" =~ "-stream" ]]; then
          DISTCheck="$RedHatSeries""-stream"
        elif [[ "$RedHatSeries" -le "5" ]]; then
          echo -ne "\n[${red}Warning${plain}] $Relese $DISTCheck is not supported!\n"
        else
          echo -ne "\n[${red}Error${plain}] Invaild $DIST! version!\n"
        fi
      }
      LinuxMirror=$(selectMirror "$Relese" "$DISTCheck" "$VER" "$tmpMirror")
      DIST="$DISTCheck"
    fi
    if [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
      [[ "$RedHatSeries" =~ [0-9]{${#1}} ]] && {
# RockyLinux releases history:
# https://wiki.rockylinux.org/rocky/version/
# AlmaLinux releases history:
# https://wiki.almalinux.org/release-notes/
        if [[ "$linux_relese" == 'rockylinux' || "$linux_relese" == 'almalinux' ]] && [[ "$RedHatSeries" -le "7" ]]; then
          echo -ne "\n[${red}Warning${plain}] $Relese $DISTCheck is not supported!\n"
          exit 1
# Fedora releases history:
# https://en.wikipedia.org/wiki/Fedora_Linux_release_history
        elif [[ "$linux_relese" == 'fedora' ]] && [[ "$RedHatSeries" -le "36" ]]; then
          echo -ne "\n[${red}Warning${plain}] $Relese $DISTCheck is not supported!\n"
          exit 1
        fi
      }
      LinuxMirror=$(selectMirror "$Relese" "$DISTCheck" "$VER" "$tmpMirror")
      DIST="$DISTCheck"
    fi
    [[ -z "$DIST" ]] && {
      echo -ne "\nThe dists version not found in this mirror, Please check it! \n\n"
      bash $0 error
      exit 1
    }
    if [[ "$linux_relese" == 'centos' ]] && [[ "$RedHatSeries" -le "7" ]]; then
      wget --no-check-certificate -qO- "$LinuxMirror/$DIST/os/$VER/.treeinfo" | grep -q 'general'
      [[ $? != '0' ]] && {
        echo -ne "\n[${red}Warning${plain}] $Relese $DISTCheck was not found in this mirror, Please change mirror try again!\n"
        exit 1
      }
    elif [[ "$linux_relese" == 'centos' && "$RedHatSeries" -ge "8" ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]]; then
      wget --no-check-certificate -qO- "$LinuxMirror/$DIST/BaseOS/$VER/os/media.repo" | grep -q 'mediaid'
      [[ $? != '0' ]] && {
        echo -ne "\n[${red}Warning${plain}] $Relese $DISTCheck was not found in this mirror, Please change mirror try again!\n"
        exit 1
      }
    elif [[ "$linux_relese" == 'fedora' ]]; then
      wget --no-check-certificate -qO- "$LinuxMirror/releases/$DIST/Server/$VER/os/media.repo" | grep -q 'mediaid'
      [[ $? != '0' ]] && {
        echo -ne "\n[${red}Warning${plain}] $Relese $DISTCheck was not found in this mirror, Please change mirror try again!\n"
        exit 1
      }
    fi    
  fi
fi

[[ -z "$LinuxMirror" ]] && {
  echo -ne "\n[${red}Error${plain}] Invaild mirror! \n"
  [ "$Relese" == 'Debian' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://www.debian.org/mirror/list\n\n"
  [ "$Relese" == 'Ubuntu' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://launchpad.net/ubuntu/+archivemirrors\n\n"
  [ "$Relese" == 'Kali' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://http.kali.org/README.mirrorlist\n\n"
  [ "$Relese" == 'AlpineLinux' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://mirrors.alpinelinux.org/\n\n"
  [ "$Relese" == 'CentOS' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://www.centos.org/download/mirrors/\n\n"
  [ "$Relese" == 'RockyLinux' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://mirrors.rockylinux.org/mirrormanager/mirrors\n\n"
  [ "$Relese" == 'AlmaLinux' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://mirrors.almalinux.org/\n\n"
  [ "$Relese" == 'Fedora' ] && echo -ne "${yellow}Please check mirror lists:${plain} https://mirrors.fedoraproject.org/\n\n"
  # bash $0 error
  exit 1
}

[[ "$setNetbootXyz" == "1" ]] && SpikCheckDIST="1"
if [[ "$SpikCheckDIST" == '0' ]]; then
  echo -ne "\n${aoiBlue}# Check DIST${plain}\n"
  [[ "$linux_relese" == 'debian' ]] && DistsList="$(wget --no-check-certificate -qO- "$LinuxMirror/dists/" | grep -o 'href=.*/"' | cut -d'"' -f2 | sed '/-\|old\|README\|Debian\|experimental\|stable\|test\|sid\|devel/d' | grep '^[^/]' | sed -n '1h;1!H;$g;s/\n//g;s/\//\;/g;$p')"
  [[ "$linux_relese" == 'kali' ]] && DistsList="$(wget --no-check-certificate -qO- "$LinuxMirror/dists/" | grep -o 'href=.*/"' | cut -d'"' -f2 | sed '/debian\|only\|last\|edge/d' | grep '^[^/]' | sed -n '1h;1!H;$g;s/\n//g;s/\//\;/g;$p')"
  [[ "$linux_relese" == 'alpinelinux' ]] && DistsList="$(wget --no-check-certificate -qO- "$LinuxMirror/" | grep -o 'href=.*/"' | cut -d'"' -f2 | sed '/-/d' | grep '^[^/]' | sed -n '1h;1!H;$g;s/\n//g;s/\//\;/g;$p')"
  for CheckDEB in `echo "$DistsList" | sed 's/;/\n/g'`
    do
# In some mirror, the value of parameter "DistsList" is "?C=N;O=Dbookworm;bullseye;buster;http:;;wisepoint.jp;product;wpshibb;"
# The second item in "DistsList" which is splited by ";" is O=Dbookworm.
# So we need to check whether "DIST" is approximately equal(contains) to "CheckDEB".
      [[ "$CheckDEB" =~ "$DIST" ]] && FindDists='1' && break;
    done
  [[ "$FindDists" == '0' ]] && {
    echo -ne "\n[${red}Error${plain}] The dists version not found, Please check it! \n\n"
    exit 1
  }
  echo -e "\nSuccess"
fi

if [[ "$ddMode" == '1' ]]; then
  if [[ "$targetRelese" == 'Ubuntu' ]]; then
    ubuntuDIST="$(echo "$finalDIST" |sed -r 's/(.*)/\L\1/')"
    UbuntuDistNum=`echo "$ubuntuDIST" | cut -d'.' -f1`
    echo "$ubuntuDIST" |grep -q '[0-9]'
    [[ $? -eq '0' ]] && {
      ubuntuDigital="$(echo "$ubuntuDIST" |grep -o '[\.0-9]\{1,\}' |sed -n '1h;1!H;$g;s/\n//g;$p')"
      ubuntuDigital1=`echo "$ubuntuDigital" | cut -d'.' -f1`
      ubuntuDigital2=`echo "$ubuntuDigital" | cut -d'.' -f2`
      if [[ "$ubuntuDigital1" -le "19" || "$ubuntuDigital1" -ge "23" || $((${ubuntuDigital1} % 2)) = 1 ]] || [[ "$ubuntuDigital2" != "04" ]]; then
        echo -ne "\n[${red}Error${plain}] The dists version not found, Please check it! \n'"
        exit 1
      fi
      [[ -n $ubuntuDigital ]] && {
        # [[ "$ubuntuDigital" == '12.04' ]] && finalDIST='precise'
        # [[ "$ubuntuDigital" == '14.04' ]] && finalDIST='trusty'
        # [[ "$ubuntuDigital" == '16.04' ]] && finalDIST='xenial'
        # [[ "$ubuntuDigital" == '18.04' ]] && finalDIST='bionic'
        [[ "$ubuntuDigital" == '20.04' ]] && finalDIST='focal'
# Ubuntu 22.04 and future versions started to using "Cloud-init" to replace legacy "d-i(Debian installer)" which is designed to support network installation of Debian like system.
# "Cloud-init" make a high hardware requirements of the server, one requirement must be demanded is CPU virtualization support.
# Many vps which are virtualizated by a physical machine, despite parent machine support virtualization, but sub-servers don't support.
# Because Ubuntu 22.04 and future version removed critical file of "initrd.gz" and "linux" which are critical files to implement "d-i".
# For example, the official of Ubuntu 22.04(jammy) mirror site doesn't provide any related files to download, the following is here:
# http://archive.ubuntu.com/ubuntu/dists/jammy/main/installer-amd64/current/legacy-images/
# So we have no possibility to accomplish Ubuntu network installation in future.
# Canonical.inc is son of a bitch, they change back and forth, pood and pee everywhere.
# More discussions: https://discourse.ubuntu.com/t/netbooting-the-live-server-installer/14510/18
        [[ "$ubuntuDigital" == '22.04' ]] && finalDIST='jammy'
# Ubuntu releases reference: https://releases.ubuntu.com/
      }
    }
    if [[ "$VER" == "x86_64" ]] || [[ "$VER" == "x86-64" ]]; then
      ubuntuVER="amd64"
    elif [[ "$VER" == "aarch64" ]]; then
      ubuntuVER="arm64"
    fi
    if [[ "$tmpURL" == "" ]]; then
      tmpURL="https://cloud-images.a.disk.re/Ubuntu/"
    fi
    echo "$tmpURL" | grep -q '^http://\|^ftp://\|^https://'
    [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Please input a vaild URL, only support http://, ftp:// and https:// ! \n" && exit 1
    tmpURLCheck=$(echo $(curl -s -I -X GET $tmpURL) | grep -wi "http/[0-9]*" | awk '{print $2}')
    [[ -z "$tmpURLCheck" || ! "$tmpURLCheck" =~ ^[0-9]+$ ]] && {
      echo -ne "\n[${red}Error${plain}] The mirror of DD images is temporarily unavailable!\n"
      exit 1
    }
    DDURL="$tmpURL$finalDIST-server-cloudimg-$ubuntuVER.raw"
    ReleaseName="$targetRelese $finalDIST $ubuntuVER"
  elif [[ "$targetRelese" == 'Windows' ]]; then
# If the range of IPv4 address is too narrow, it will cause IPv4 address and subnet are added with a fatal by using "CMD(*.bat script)" of
# "wmic nicconfig where ipenabled=true call enablestatic(%staticip%),(%subnetmask%)" on newly installed Windows OS.
    [[ "$actualIp4Prefix" -gt "24" ]] && { actualIp4Prefix="24"; actualIp4Subnet=$(netmask "$actualIp4Prefix"); }
    if [[ -z "$tmpURL" ]]; then
      tmpURL="https://dl.lamp.sh/vhd"
      [[ `echo "$finalDIST" | grep -i "server"` ]] && tmpFinalDIST=`echo $finalDIST | awk -F ' |-|_' '{print $2}'`
      [[ `echo "$finalDIST" | grep -i "pro"` || `echo "$finalDIST" | grep -i "ltsc"` ]] && tmpFinalDIST=`echo $finalDIST | awk -F ' |-|_' '{print $1}'`
      [[ "$finalDIST" =~ ^[0-9]+$ ]] && tmpFinalDIST="$finalDIST"
      [[ "$targetLang" == 'jp' ]] && targetLang='ja'
      [[ "$targetLang" == 'zh' ]] && targetLang='cn'
      if [[ "$tmpFinalDIST" -ge "2012" && "$tmpFinalDIST" -le "2019" ]]; then
        tmpTargetLang="$targetLang"
      else
        [[ "$targetLang" == 'cn' ]] && tmpTargetLang="zh-""$targetLang"
        [[ "$targetLang" == 'en' ]] && tmpTargetLang="$targetLang""-us"
        [[ "$targetLang" == 'ja' ]] && tmpTargetLang="$targetLang""-jp"
      fi
      if [[ "$tmpFinalDIST" == "2012" ]]; then
        tmpURL="$tmpURL/"${tmpTargetLang}"_win"${tmpFinalDIST}"r2.xz"
        showFinalDIST="Server $tmpFinalDIST R2"
      elif [[ "$tmpFinalDIST" -ge "2016" && "$tmpFinalDIST" -le "2022" ]]; then
        tmpURL="$tmpURL/"${tmpTargetLang}"_win"${tmpFinalDIST}".xz"
        showFinalDIST="Server $tmpFinalDIST"
      elif [[ "$tmpFinalDIST" -ge "10" && "$tmpFinalDIST" -le "11" ]]; then
        [[ "$tmpFinalDIST" == "10" ]] && { tmpURL="$tmpURL/"${tmpTargetLang}"_windows"${tmpFinalDIST}"_ltsc.xz"; showFinalDIST="$tmpFinalDIST Enterprise LTSC"; }
        [[ "$tmpFinalDIST" == "11" ]] && { tmpURL="$tmpURL/"${tmpTargetLang}"_windows"${tmpFinalDIST}"_22h2.xz"; showFinalDIST="$tmpFinalDIST Pro for Workstations 22H2"; }
      fi
      if [[ "$EfiSupport" == "enabled" ]]; then
        [[ "$tmpFinalDIST" == "10" ]] && tmpURL=`echo $tmpURL | sed 's/windows/win/g'`
        tmpURL=`echo $tmpURL | sed 's/...$/_uefi.xz/g'`
      fi
      ReleaseName="$targetRelese $showFinalDIST"
    else
      showFinalDIST=""
      ReleaseName="$targetRelese"
    fi
    verifyUrlValidationOfDdImages "$tmpURL"
  elif [[ -z "$targetRelese" && "$tmpURL" != "" ]]; then
    verifyUrlValidationOfDdImages "$tmpURL"
    ReleaseName="Self-Modified OS"
  else
    echo -ne "\n[${red}Warning${plain}] Please input a vaild image URL!\n"
    exit 1
  fi
fi

# The first network adapter name is must be "eth0" if kernel is loaded with parameter "net.ifnames=0 biosdevname=0".
# If the names of network adapters on original system were not be redirected, we can speculate them according to the sequence 
# which they had plugged into the system by a physical queue if newly installed system need to redirect network adapters.
if [[ "$setInterfaceName" == "1" ]] && [[ ! "$interface4" =~ "eth" || ! "$interface6" =~ "eth" ]]; then
  interface4="eth""$interface4DeviceOrder"
  interface6="eth""$interface6DeviceOrder"
  interface="$interface4"
  [[ "$IPStackType" == "IPv6Stack" ]] && interface="$interface6"
fi

if [ -z "$interfaceSelect" ]; then
  if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'ubuntu' ]] || [[ "$linux_relese" == 'kali' ]]; then
    interfaceSelect="auto"
  elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
    interfaceSelect="link"
  fi
# Some cloud providers using the second or further order back of interface adapter like "eth1" to config public networking usually and we don't know what's role of "eth0".
  [[ "$interfacesNum" -ge "2" ]] && {
    if [[ "$IPStackType" == "IPv6Stack" ]]; then
# Approximately equal "=~" to "eth..." is for the redirected situation, "device order" is on the contrary for an un-redirected example.
      [[ "$interface6" =~ "eth" && `echo "$interface6" | grep -o '[0-9]'` != "0" ]] || [[ "$interface6DeviceOrder" != "0" ]] && {
        interfaceSelect="$interface6"
      }
    elif [[ "$IPStackType" == "BiStack" || "$IPStackType" == "IPv4Stack" ]]; then
      [[ "$interface4" =~ "eth" && `echo "$interface4" | grep -o '[0-9]'` != "0" ]] || [[ "$interface4DeviceOrder" != "0" ]] && {
        interfaceSelect="$interface4"
      }
    fi
  }
else
# If the kernel of original system is loaded with parameter "net.ifnames=0 biosdevname=0" and users don't want to set this
# one in new system, they have to assign a valid, real name of their network adapter and the parameter "$interface"
# will be written to new network configuration in preseed file for new system.
  interface4=`echo "$interfaceSelect" | cut -d' ' -f 1`
  interface6=`echo "$interfaceSelect" | cut -d' ' -f 2`
  interface="$interface4"
  [[ -z "$interface6" ]] && {
    interface=`echo "$interfaceSelect" | sed 's/[[:space:]]//g'`
    interface6="$interface"
  }
fi

echo -ne "\n${aoiBlue}# Installation Starting${plain}\n"

[[ "$ddMode" == '1' ]] && echo -ne "\n${blue}Overwriting Packaged Image Mode${plain} Target System [${yellow}$ReleaseName${plain}]\n$DDURL\n"

if [[ "$linux_relese" == 'centos' ]]; then
  if [[ "$DIST" != "$UNVER" ]]; then
    awk 'BEGIN{print '${UNVER}'-'${DIST}'}' |grep -q '^-'
    if [ $? != '0' ]; then
      UNKNOWHW='1'
      echo -ne "\nThe version lower than ${red}$UNVER${plain} may not support in auto mode!\n"
    fi
  fi
fi
[[ "$setNetbootXyz" == "0" ]] && echo -ne "\n[${yellow}$Relese${plain}] [${yellow}$DIST${plain}] [${yellow}$VER${plain}] Downloading...\n" || echo -ne "\n[${yellow}netboot.xyz${plain}] Downloading...\n"

# RAM of RedHat series is 2GB required at least.
[[ "$setNetbootXyz" == "0" ]] && {
  checkMem "$linux_relese" "$RedHatSeries" "$targetRelese"
  Add_OPTION="$Add_OPTION $lowmemLevel"
}

if [[ "$setNetbootXyz" == "1" ]]; then
  [[ "$VER" == "x86_64" || "$VER" == "amd64" ]] && apt install grub-imageboot -y
  if [[ "$EfiSupport" == "enabled" ]] || [[ "$VER" == "aarch64" || "$VER" == "arm64" ]]; then
    echo -ne "\n[${red}Error${plain}] Netbootxyz doesn't support $VER architecture!\n"
    bash $0 error
    exit 1
  fi
# NetbootXYZ set to boot from an existing Linux installation using GRUB
# Reference: https://netboot.xyz/docs/booting/grub
  if [[ "$IsCN" == "cn" ]]; then
    NetbootXyzUrl="https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/RedHat/NetbootXyz/netboot.xyz.iso"
    NetbootXyzGrub="https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/RedHat/NetbootXyz/60_grub-imageboot"
  else
    NetbootXyzUrl="https://boot.netboot.xyz/ipxe/netboot.xyz.iso"
    NetbootXyzGrub="https://raw.githubusercontent.com/formorer/grub-imageboot/master/bin/60_grub-imageboot"
  fi
  [[ ! -d "/boot/images/" ]] && mkdir /boot/images/
  rm -rf /boot/images/netboot.xyz.iso
  echo -ne "[${yellow}Mirror${plain}] $NetbootXyzUrl\n"
  wget --no-check-certificate -qO '/boot/images/netboot.xyz.iso' "$NetbootXyzUrl"
  [[ ! -f "/etc/grub.d/60_grub-imageboot" ]] && wget --no-check-certificate -qO '/etc/grub.d/60_grub-imageboot' "$NetbootXyzGrub"
  chmod 755 /etc/grub.d/60_grub-imageboot
  [[ ! -z "$GRUBTYPE" && "$GRUBTYPE" == "isGrub2" ]] && {
    rm -rf /boot/memdisk
    cp /usr/share/syslinux/memdisk /boot/memdisk
    ln -s /usr/share/grub/grub-mkconfig_lib /usr/lib/grub/grub-mkconfig_lib
  }
elif [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'ubuntu' ]] || [[ "$linux_relese" == 'kali' ]]; then
  [ "$DIST" == "focal" ] && legacy="legacy-" || legacy=""
  InitrdUrl="${LinuxMirror}/dists/${DIST}/main/installer-${VER}/current/${legacy}images/netboot/${linux_relese}-installer/${VER}/initrd.gz"
  VmLinuzUrl="${LinuxMirror}/dists/${DIST}${inUpdate}/main/installer-${VER}/current/${legacy}images/netboot/${linux_relese}-installer/${VER}/linux"
  [[ "$linux_relese" == 'kali' ]] && {
    InitrdUrl="${LinuxMirror}/dists/${DIST}/main/installer-${VER}/current/images/netboot/debian-installer/${VER}/initrd.gz"
    VmLinuzUrl="${LinuxMirror}/dists/${DIST}/main/installer-${VER}/current/images/netboot/debian-installer/${VER}/linux"
  }
  echo -ne "[${yellow}Mirror${plain}] $InitrdUrl\n\t $VmLinuzUrl\n"
  wget --no-check-certificate -qO '/tmp/initrd.img' "$InitrdUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'initrd.img' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
  wget --no-check-certificate -qO '/tmp/vmlinuz' "$VmLinuzUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'vmlinuz' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
  MirrorHost="$(echo "$LinuxMirror" |awk -F'://|/' '{print $2}')"
  MirrorFolder="$(echo "$LinuxMirror" |awk -F''${MirrorHost}'' '{print $2}')"
  [ -n "$MirrorFolder" ] || MirrorFolder="/"
elif [[ "$linux_relese" == 'alpinelinux' ]]; then
  InitrdUrl="${LinuxMirror}/${DIST}/releases/${VER}/netboot/initramfs-lts"
  VmLinuzUrl="${LinuxMirror}/${DIST}/releases/${VER}/netboot/vmlinuz-lts"
  ModLoopUrl="${LinuxMirror}/${DIST}/releases/${VER}/netboot/modloop-lts"
  echo -ne "[${yellow}Mirror${plain}] $InitrdUrl\n\t $VmLinuzUrl\n"
  wget --no-check-certificate -qO '/tmp/initrd.img' "$InitrdUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'initramfs-lts' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
  wget --no-check-certificate -qO '/tmp/vmlinuz' "$VmLinuzUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'vmlinuz-lts' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
elif [[ "$linux_relese" == 'centos' ]] && [[ "$RedHatSeries" -le "7" ]]; then
  InitrdUrl="${LinuxMirror}/${DIST}/os/${VER}/images/pxeboot/initrd.img"
  VmLinuzUrl="${LinuxMirror}/${DIST}/os/${VER}/images/pxeboot/vmlinuz"
  echo -ne "[${yellow}Mirror${plain}] $InitrdUrl\n\t $VmLinuzUrl\n"
  wget --no-check-certificate -qO '/tmp/initrd.img' "$InitrdUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'initrd.img' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
  wget --no-check-certificate -qO '/tmp/vmlinuz' "$VmLinuzUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'vmlinuz' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
elif [[ "$linux_relese" == 'centos' && "$RedHatSeries" -ge "8" ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]]; then
  InitrdUrl="${LinuxMirror}/${DIST}/BaseOS/${VER}/os/images/pxeboot/initrd.img"
  VmLinuzUrl="${LinuxMirror}/${DIST}/BaseOS/${VER}/os/images/pxeboot/vmlinuz"
  echo -ne "[${yellow}Mirror${plain}] $InitrdUrl\n\t $VmLinuzUrl\n"
  wget --no-check-certificate -qO '/tmp/initrd.img' "$InitrdUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'initrd.img' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
  wget --no-check-certificate -qO '/tmp/vmlinuz' "$VmLinuzUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'vmlinuz' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
elif [[ "$linux_relese" == 'fedora' ]]; then
  InitrdUrl="${LinuxMirror}/releases/${DIST}/Server/${VER}/os/images/pxeboot/initrd.img"
  VmLinuzUrl="${LinuxMirror}/releases/${DIST}/Server/${VER}/os/images/pxeboot/vmlinuz"
  echo -ne "[${yellow}Mirror${plain}] $InitrdUrl\n\t $VmLinuzUrl\n"
  wget --no-check-certificate -qO '/tmp/initrd.img' "$InitrdUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'initrd.img' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
  wget --no-check-certificate -qO '/tmp/vmlinuz' "$VmLinuzUrl"
  [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download 'vmlinuz' for ${yellow}$linux_relese${plain} failed! \n" && exit 1
else
  bash $0 error
  exit 1
fi

if [[ "$IncFirmware" == '1' ]]; then
  if [[ "$linux_relese" == 'debian' ]]; then
    if [[ "$IsCN" == "cn" ]]; then
      wget --no-check-certificate -qO '/tmp/firmware.cpio.gz' "https://mirrors.ustc.edu.cn/debian-cdimage/unofficial/non-free/firmware/${DIST}/current/firmware.cpio.gz"
      [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download firmware for ${red}$linux_relese${plain} failed! \n" && exit 1
    else
      wget --no-check-certificate -qO '/tmp/firmware.cpio.gz' "http://cdimage.debian.org/cdimage/unofficial/non-free/firmware/${DIST}/current/firmware.cpio.gz"
      [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download firmware for ${red}$linux_relese${plain} failed! \n" && exit 1
    fi
    if [[ "$ddMode" == '1' ]]; then
      vKernel_udeb=$(wget --no-check-certificate -qO- "http://$LinuxMirror/dists/$DIST/main/installer-$VER/current/images/udeb.list" | grep '^acpi-modules' | head -n1 | grep -o '[0-9]\{1,2\}.[0-9]\{1,2\}.[0-9]\{1,2\}-[0-9]\{1,2\}' | head -n1)
      [[ -z "vKernel_udeb" ]] && vKernel_udeb="6.1.0-11"
    fi
  elif [[ "$linux_relese" == 'kali' ]]; then
    if [[ "$IsCN" == "cn" ]]; then
      wget --no-check-certificate -qO /root/kaliFirmwareCheck 'https://mirrors.tuna.tsinghua.edu.cn/kali/pool/non-free/f/firmware-nonfree/?C=S&O=D'
      kaliFirmwareName=$(grep "href=\"firmware-nonfree" /root/kaliFirmwareCheck | head -n 1 | awk -F'\">' '/tar.xz/{print $3}' | cut -d'<' -f1 | cut -d'/' -f2)
      wget --no-check-certificate -qO '/tmp/kali_firmware.tar.xz' "https://mirrors.tuna.tsinghua.edu.cn/kali/pool/non-free/f/firmware-nonfree/$kaliFirmwareName"
      [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download firmware for ${red}$linux_relese${plain} failed! \n" && exit 1    
      rm -rf /root/kaliFirmwareCheck
    else
      wget --no-check-certificate -qO /root/kaliFirmwareCheck 'https://mirrors.ocf.berkeley.edu/kali/pool/non-free/f/firmware-nonfree/?C=S&O=D'
      kaliFirmwareName=$(grep "href=\"firmware-nonfree" /root/kaliFirmwareCheck | head -n 1 | awk -F'\">' '/tar.xz/{print $3}' | cut -d'<' -f1 | cut -d'/' -f2)
      wget --no-check-certificate -qO '/tmp/kali_firmware.tar.xz' "https://mirrors.ocf.berkeley.edu/kali/pool/non-free/f/firmware-nonfree/$kaliFirmwareName"
      [[ $? -ne '0' ]] && echo -ne "\n[${red}Error${plain}] Download firmware for ${red}$linux_relese${plain} failed! \n" && exit 1
      rm -rf /root/kaliFirmwareCheck
    fi
    decompressedKaliFirmwareDir=$(echo $kaliFirmwareName | cut -d'.' -f 1 | sed 's/_/-/g')
  fi
fi

[[ -d /tmp/boot ]] && rm -rf /tmp/boot
mkdir -p /tmp/boot
cd /tmp/boot

if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'ubuntu' ]] || [[ "$linux_relese" == 'kali' ]] || [[ "$linux_relese" == 'alpinelinux' ]]; then
  COMPTYPE="gzip"
elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
  COMPTYPE="$(file ../initrd.img |grep -o ':.*compressed data' |cut -d' ' -f2 |sed -r 's/(.*)/\L\1/' |head -n1)"
  [[ -z "$COMPTYPE" ]] && echo "Detect compressed type fail." && exit 1
fi
CompDected='0'
for COMP in `echo -en 'gzip\nlzma\nxz'`
  do
    if [[ "$COMPTYPE" == "$COMP" ]]; then
      CompDected='1'
      if [[ "$COMPTYPE" == 'gzip' ]]; then
        NewIMG="initrd.img.gz"
      else
        NewIMG="initrd.img.$COMPTYPE"
      fi
      mv -f "/tmp/initrd.img" "/tmp/$NewIMG"
      break;
    fi
  done
[[ "$CompDected" != '1' ]] && echo "Detect compressed type not support." && exit 1
[[ "$COMPTYPE" == 'lzma' ]] && UNCOMP='xz --format=lzma --decompress'
[[ "$COMPTYPE" == 'xz' ]] && UNCOMP='xz --decompress'
[[ "$COMPTYPE" == 'gzip' ]] && UNCOMP='gzip -d'
$UNCOMP < /tmp/$NewIMG | cpio --extract --make-directories --preserve-modification-time >>/dev/null 2>&1

if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]] || [[ "$linux_relese" == 'ubuntu' ]]; then
  DebianPreseedProcess
  if [[ "$loaderMode" != "0" ]] && [[ "$setNet" == '0' ]]; then
    sed -i '/netcfg\/disable_autoconfig/d' /tmp/boot/preseed.cfg
    sed -i '/netcfg\/dhcp_options/d' /tmp/boot/preseed.cfg
    sed -i '/netcfg\/get_.*/d' /tmp/boot/preseed.cfg
    sed -i '/netcfg\/confirm_static/d' /tmp/boot/preseed.cfg
  fi
  [[ "$partitionTable" == "gpt" ]] && sed -i 's/default_filesystem string ext4/default_filesystem string xfs/g' /tmp/boot/preseed.cfg
# If server has only one disk, lv/vg/pv volumes removement by force should be disallowed, it may causes partitioner continuous execution but not finished.
  if [[ "$disksNum" -le "1" || "$setDisk" != "all" || -n "$setRaid" ]]; then
    sed -i 's/lvremove --select all -ff -y;//g' /tmp/boot/preseed.cfg
    sed -i 's/vgremove --select all -ff -y;//g' /tmp/boot/preseed.cfg
    sed -i 's/pvremove \/dev\/\* -ff -y;//g' /tmp/boot/preseed.cfg
  elif [[ "$disksNum" -ge "2" && "$setDisk" == "all" ]]; then
# Some virtual machines will hanging on partition step if execute pvremove.
    [[ -z "$virtWhat" ]] || sed -i 's/pvremove \/dev\/\* -ff -y;//g' /tmp/boot/preseed.cfg
  fi
  if [[ "$disksNum" -ge "2" ]] && [[ -n "$setRaid" ]]; then
    sed -i 's/d-i partman\/early_command.*//g' /tmp/boot/preseed.cfg
    sed -ri "/d-i grub-installer\/bootdev.*/c\d-i grub-installer\/bootdev string $AllDisks" /tmp/boot/preseed.cfg
  fi
# Debian 8 and former or Raid mode don't support xfs.
  [[ "$DebianDistNum" -le "8" || -n "$setRaid" ]] && sed -i '/d-i\ partman\/default_filesystem string xfs/d' /tmp/boot/preseed.cfg
  if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]]; then
    sed -i '/user-setup\/allow-password-weak/d' /tmp/boot/preseed.cfg
    sed -i '/user-setup\/encrypt-home/d' /tmp/boot/preseed.cfg
    sed -i '/pkgsel\/update-policy/d' /tmp/boot/preseed.cfg
    sed -i 's/umount\ \/media.*true\;\ //g' /tmp/boot/preseed.cfg
    [[ -f '/tmp/firmware.cpio.gz' ]] && gzip -d < /tmp/firmware.cpio.gz | cpio --extract --verbose --make-directories --no-absolute-filenames >>/dev/null 2>&1
# Uncompressed hardware drivers size of Kali firmware non-free such as "firmware-nonfree_20230210.orig.tar.xz" is almost 800MB,
# if the physical memory of server is below 3GB, I suggested that not load parameter "-firmware".
    [[ -f '/tmp/kali_firmware.tar.xz' ]] && {
      tar -Jxvf '/tmp/kali_firmware.tar.xz' -C /tmp/
      mv /tmp/$decompressedKaliFirmwareDir/* '/tmp/boot/lib/firmware/'
    }
  fi
# To avoid to entry into low memory mode.
  [[ "$TotalMem1" -ge "2558072" || "$TotalMem2" -ge "2558072" ]] && sed -i '/d-i\ lowmem\/low note/d' /tmp/boot/preseed.cfg
# Ubuntu 20.04 and below does't support xfs, force grub-efi installation to the removable media path may cause grub install failed, low memory mode.
  if [[ "$linux_relese" == 'ubuntu' ]]; then
    sed -i '/d-i\ partman\/default_filesystem string xfs/d' /tmp/boot/preseed.cfg
    sed -i '/d-i\ grub-installer\/force-efi-extra-removable/d' /tmp/boot/preseed.cfg
    sed -i '/d-i\ lowmem\/low note/d' /tmp/boot/preseed.cfg
  fi
# Kali preseed.cfg reference:
# https://github.com/iesplin/kali-preseed/blob/master/preseed/core-minimal.cfg
#
# Kali metapackages reference:
# https://www.kali.org/docs/general-use/metapackages/
  if [[ "$linux_relese" == 'kali' ]]; then
    sed -i 's/first multiselect minimal/first multiselect standard/g' /tmp/boot/preseed.cfg
    sed -i 's/upgrade select none/upgrade select full-upgrade/g' /tmp/boot/preseed.cfg
    sed -i 's/include string openssh-server/include string kali-linux-core openssh-server/g' /tmp/boot/preseed.cfg
    sed -i 's/d-i grub-installer\/with_other_os boolean true//g' /tmp/boot/preseed.cfg
  fi
# Disable get security updates for those versions of Debian which were 'EOL'(9 and former in 2023.07) or Kali.
  if [[ "$linux_relese" != 'kali' ]]; then
    if [[ "$linux_relese" == 'debian' && "$DebianDistNum" -ge "10" ]]; then
      sed -i '/d-i\ apt-setup\/services-select multiselect/d' /tmp/boot/preseed.cfg
      sed -i '/d-i\ apt-setup\/enable-source-repositories boolean false/d' /tmp/boot/preseed.cfg
    fi
  fi
# Static network environment doesn't support ntp clock setup.
  if [[ "$Network4Config" == "isStatic" ]] || [[ "$Network6Config" == "isStatic" ]]; then
    sed -i 's/ntp boolean true/ntp boolean false/g' /tmp/boot/preseed.cfg
    sed -i '/d-i\ clock-setup\/ntp-server string ntp.nict.jp/d' /tmp/boot/preseed.cfg
  fi
# If network adapter is not redirected, delete this setting to new system.
  [[ "$setInterfaceName" == "0" ]] && sed -i 's/net.ifnames=0 biosdevname=0//g' /tmp/boot/preseed.cfg
# If user not setting disable IPv6 or network is IPv6 or bio-stack, "ipv6.disable=1" should be deleted.
  [[ "$setIPv6" == "1" ]] && sed -i 's/ipv6.disable=1//g' /tmp/boot/preseed.cfg

  [[ "$ddMode" == '1' ]] && {
    WinNoDHCP(){
      echo -ne "for\0040\0057f\0040\0042tokens\00753\0052\0042\0040\0045\0045i\0040in\0040\0050\0047netsh\0040interface\0040show\0040interface\0040\0136\0174more\0040\00533\0040\0136\0174findstr\0040\0057I\0040\0057R\0040\0042本地\0056\0052\0040以太\0056\0052\0040Local\0056\0052\0040Ethernet\0042\0047\0051\0040do\0040\0050set\0040EthName\0075\0045\0045j\0051\r\nnetsh\0040\0055c\0040interface\0040ip\0040set\0040address\0040name\0075\0042\0045EthName\0045\0042\0040source\0075static\0040address\0075$IPv4\0040mask\0075$MASK\0040gateway\0075$GATE\r\nnetsh\0040\0055c\0040interface\0040ip\0040add\0040dnsservers\0040name\0075\0042\0045EthName\0045\0042\0040address\00758\00568\00568\00568\0040index\00751\0040validate\0075no\r\n\r\n" >>'/tmp/boot/net.tmp';
    }
    WinRDP(){
      echo -ne "netsh\0040firewall\0040set\0040portopening\0040protocol\0075ALL\0040port\0075$WinRemote\0040name\0075RDP\0040mode\0075ENABLE\0040scope\0075ALL\0040profile\0075ALL\r\nnetsh\0040firewall\0040set\0040portopening\0040protocol\0075ALL\0040port\0075$WinRemote\0040name\0075RDP\0040mode\0075ENABLE\0040scope\0075ALL\0040profile\0075CURRENT\r\nreg\0040add\0040\0042HKLM\0134SYSTEM\0134CurrentControlSet\0134Control\0134Network\0134NewNetworkWindowOff\0042\0040\0057f\r\nreg\0040add\0040\0042HKLM\0134SYSTEM\0134CurrentControlSet\0134Control\0134Terminal\0040Server\0042\0040\0057v\0040fDenyTSConnections\0040\0057t\0040reg\0137dword\0040\0057d\00400\0040\0057f\r\nreg\0040add\0040\0042HKLM\0134SYSTEM\0134CurrentControlSet\0134Control\0134Terminal\0040Server\0134Wds\0134rdpwd\0134Tds\0134tcp\0042\0040\0057v\0040PortNumber\0040\0057t\0040reg\0137dword\0040\0057d\0040$WinRemote\0040\0057f\r\nreg\0040add\0040\0042HKLM\0134SYSTEM\0134CurrentControlSet\0134Control\0134Terminal\0040Server\0134WinStations\0134RDP\0055Tcp\0042\0040\0057v\0040PortNumber\0040\0057t\0040reg\0137dword\0040\0057d\0040$WinRemote\0040\0057f\r\nreg\0040add\0040\0042HKLM\0134SYSTEM\0134CurrentControlSet\0134Control\0134Terminal\0040Server\0134WinStations\0134RDP\0055Tcp\0042\0040\0057v\0040UserAuthentication\0040\0057t\0040reg\0137dword\0040\0057d\00400\0040\0057f\r\nFOR\0040\0057F\0040\0042tokens\00752\0040delims\0075\0072\0042\0040\0045\0045i\0040in\0040\0050\0047SC\0040QUERYEX\0040TermService\0040\0136\0174FINDSTR\0040\0057I\0040\0042PID\0042\0047\0051\0040do\0040TASKKILL\0040\0057F\0040\0057PID\0040\0045\0045i\r\nFOR\0040\0057F\0040\0042tokens\00752\0040delims\0075\0072\0042\0040\0045\0045i\0040in\0040\0050\0047SC\0040QUERYEX\0040UmRdpService\0040\0136\0174FINDSTR\0040\0057I\0040\0042PID\0042\0047\0051\0040do\0040TASKKILL\0040\0057F\0040\0057PID\0040\0045\0045i\r\nSC\0040START\0040TermService\r\n\r\n" >>'/tmp/boot/net.tmp';
    }
    echo -ne "\0100ECHO\0040OFF\r\n\r\ncd\0056\0076\0045WINDIR\0045\0134GetAdmin\r\nif\0040exist\0040\0045WINDIR\0045\0134GetAdmin\0040\0050del\0040\0057f\0040\0057q\0040\0042\0045WINDIR\0045\0134GetAdmin\0042\0051\0040else\0040\0050\r\necho\0040CreateObject\0136\0050\0042Shell\0056Application\0042\0136\0051\0056ShellExecute\0040\0042\0045\0176s0\0042\0054\0040\0042\0045\0052\0042\0054\0040\0042\0042\0054\0040\0042runas\0042\0054\00401\0040\0076\0076\0040\0042\0045temp\0045\0134Admin\0056vbs\0042\r\n\0042\0045temp\0045\0134Admin\0056vbs\0042\r\ndel\0040\0057f\0040\0057q\0040\0042\0045temp\0045\0134Admin\0056vbs\0042\r\nexit\0040\0057b\00402\0051\r\n\r\n" >'/tmp/boot/net.tmp';
    [[ "$setNet" == '1' ]] && WinNoDHCP;
    [[ "$setNet" == '0' ]] && [[ "$AutoNet" == '0' ]] && WinNoDHCP;
    [[ "$setRDP" == '1' ]] && [[ -n "$WinRemote" ]] && WinRDP
    echo -ne "ECHO\0040SELECT\0040VOLUME\0075\0045\0045SystemDrive\0045\0045\0040\0076\0040\0042\0045SystemDrive\0045\0134diskpart\0056extend\0042\r\nECHO\0040EXTEND\0040\0076\0076\0040\0042\0045SystemDrive\0045\0134diskpart\0056extend\0042\r\nSTART\0040/WAIT\0040DISKPART\0040\0057S\0040\0042\0045SystemDrive\0045\0134diskpart\0056extend\0042\r\nDEL\0040\0057f\0040\0057q\0040\0042\0045SystemDrive\0045\0134diskpart\0056extend\0042\r\n\r\n" >>'/tmp/boot/net.tmp';
    echo -ne "cd\0040\0057d\0040\0042\0045ProgramData\0045\0057Microsoft\0057Windows\0057Start\0040Menu\0057Programs\0057Startup\0042\r\ndel\0040\0057f\0040\0057q\0040net\0056bat\r\n\r\n\r\n" >>'/tmp/boot/net.tmp';
    iconv -f 'UTF-8' -t 'GBK' '/tmp/boot/net.tmp' -o '/tmp/boot/net.bat'
    rm -rf '/tmp/boot/net.tmp'
  }
  [[ "$ddMode" == '0' ]] && {
    sed -i '/anna-install/d' /tmp/boot/preseed.cfg
    sed -i 's/wget.*\/sbin\/reboot\;\ //g' /tmp/boot/preseed.cfg
  }
# Commands of "d-i preseed/early_command" in "preseed.cfg" can only appear at one time, otherwise if there are two or more "preseed/early_command" in one preseed,
# Debian installer can only execute one of them instead of running all of them because soft hack for irregular IPv4 configs and dd Windows will all using "preseed/early_command".
  [[ "$BurnIrregularIpv4Status" == "1" ]] && {
    sed -i '/early_command string anna-install/d' /tmp/boot/preseed.cfg
  }
elif [[ "$linux_relese" == 'alpinelinux' ]]; then
# Hostname should not be "localhost"
  HostName=$(hostname)
  [[ "$HostName" == "" || "$HostName" == "localhost" ]] && {
    [[ -n "$targetRelese" ]] && HostName="$targetRelese" || HostName="AlpineLinux"
  }
# Enable IPv6
  echo "ipv6" >> /tmp/boot/etc/modules
  if [[ "$setAutoConfig" == "1" ]]; then
    AlpineInitLineNum=$(grep -E -n '^exec (/bin/busybox )?switch_root' /tmp/boot/init | cut -d: -f1)
    AlpineInitLineNum=$((AlpineInitLineNum - 1))
    if [[ "$IsCN" == "cn" ]]; then
      alpineInstallOrDdAdditionalFiles "https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Alpine/alpineInit.sh" "https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Alpine/network/resolv_cn.conf" "https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Alpine/motd.sh" "mirrors.ustc.edu.cn" "mirrors.tuna.tsinghua.edu.cn" "https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Ubuntu/ubuntuInit.sh" "https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Windows/windowsInit.sh" "https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Windows/SetupComplete.bat"
    else
      alpineInstallOrDdAdditionalFiles "https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Alpine/alpineInit.sh" "https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Alpine/network/resolv.conf" "https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Alpine/motd.sh" "archive.ubuntu.com" "ports.ubuntu.com" "https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Ubuntu/ubuntuInit.sh" "https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Windows/windowsInit.sh" "https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Windows/SetupComplete.bat"
    fi
# Cloud init configurate documents and resources:
# Ubuntu cloud images:
# https://cloud-images.ubuntu.com/daily/server/
# customize Ubuntu cloud images by our own: 
# https://bleatingsheep.org/2022/03/14/%E7%94%A8-Ubuntu-Cloud-Images-%E5%88%B6%E4%BD%9C%E8%87%AA%E5%B7%B1%E7%9A%84%E4%BA%91%E9%95%9C%E5%83%8F%EF%BC%88%E9%85%8D%E7%BD%AE-cloud-init-%E7%9A%84-NoCloud-%E6%95%B0%E6%8D%AE%E6%BA%90%EF%BC%89/
# documents from Redhat:
# https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_cloud-init_for_rhel_8/configuring-cloud-init_cloud-content
# network configuration:
# https://cloudinit.readthedocs.io/en/latest/reference/network-config-format-v2.html
# valid "*.yaml" format regulations for netplan samples:
# https://qiita.com/zen3/items/757f96cbe522a9ad397d
# netplan will deperate the "gateway4" and "gateway6", use "routes" to replace it.
# https://rohhie.net/ubuntu22-04-netplan-gateway4-has-been-deprecated/
# enable netplan configuration permanently to prevent to be changed by cloud init during rebooting from the new OS
# https://askubuntu.com/questions/1051655/convert-etc-network-interfaces-to-netplan
# disable cloud init service when next restart
# https://cloudinit.readthedocs.io/en/latest/howto/disable_cloud_init.html
    alpineNetcfgMirrorCn="https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Alpine/network/"
    alpineNetcfgMirror="https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Alpine/network/"
    [[ "$targetRelese" == 'Ubuntu' ]] && { ubuntuCloudinitMirrorCn="https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/Ubuntu/CloudInit/"; ubuntuCloudinitMirror="https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/Ubuntu/CloudInit/"; }
    if [[ "$IPStackType" == "IPv4Stack" ]]; then
      if [[ "$Network4Config" == "isDHCP" ]]; then
        if [[ "$IsCN" == "cn" ]]; then
          AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv4_dhcp_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""dhcp_interfaces.cfg"
        else
          AlpineNetworkConf="$alpineNetcfgMirror""ipv4_dhcp_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirror""dhcp_interfaces.cfg"
        fi
      elif [[ "$Network4Config" == "isStatic" ]]; then
        if [[ "$IsCN" == "cn" ]]; then
          AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv4_static_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""ipv4_static_interfaces.cfg"
        else
          AlpineNetworkConf="$alpineNetcfgMirror""ipv4_static_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirror""ipv4_static_interfaces.cfg"
        fi
      fi
      networkAdapter="$interface4"
    elif [[ "$IPStackType" == "BiStack" ]]; then
# To let Alpine Linux support IPv6 automatic config, we must install dhcpcd.
      if [[ "$Network4Config" == "isDHCP" ]] && [[ "$Network6Config" == "isDHCP" ]]; then
        [[ "$IsCN" == "cn" ]] && AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv4_ipv6_dhcp_interfaces" || AlpineNetworkConf="$alpineNetcfgMirror""ipv4_ipv6_dhcp_interfaces"
      elif [[ "$Network4Config" == "isDHCP" ]] && [[ "$Network6Config" == "isStatic" ]]; then
        [[ "$IsCN" == "cn" ]] && AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv4_dhcp_ipv6_static_interfaces" || AlpineNetworkConf="$alpineNetcfgMirror""ipv4_dhcp_ipv6_static_interfaces"
      elif [[ "$Network4Config" == "isStatic" ]] && [[ "$Network6Config" == "isDHCP" ]]; then
        [[ "$IsCN" == "cn" ]] && AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv4_static_ipv6_dhcp_interfaces" || AlpineNetworkConf="$alpineNetcfgMirror""ipv4_static_ipv6_dhcp_interfaces"
      elif [[ "$Network4Config" == "isStatic" ]] && [[ "$Network6Config" == "isStatic" ]]; then
        [[ "$IsCN" == "cn" ]] && AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv4_ipv6_static_interfaces" || AlpineNetworkConf="$alpineNetcfgMirror""ipv4_ipv6_static_interfaces"
      fi
      [[ "$targetRelese" == 'Ubuntu' ]] && {
        if [[ "$Network4Config" == "isDHCP" ]] && [[ "$Network6Config" == "isDHCP" ]]; then
          [[ "$IsCN" == "cn" ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""dhcp_interfaces.cfg" || cloudInitUrl="$ubuntuCloudinitMirror""dhcp_interfaces.cfg"
        elif [[ "$Network4Config" == "isDHCP" ]] && [[ "$Network6Config" == "isStatic" ]]; then
          [[ "$IsCN" == "cn" ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""ipv4_dhcp_ipv6_static_interfaces.cfg" || cloudInitUrl="$ubuntuCloudinitMirror""ipv4_dhcp_ipv6_static_interfaces.cfg"
        elif [[ "$Network4Config" == "isStatic" ]] && [[ "$Network6Config" == "isDHCP" ]]; then
          [[ "$IsCN" == "cn" ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""ipv4_static_ipv6_dhcp_interfaces.cfg" || cloudInitUrl="$ubuntuCloudinitMirror""ipv4_static_ipv6_dhcp_interfaces.cfg"
        elif [[ "$Network4Config" == "isStatic" ]] && [[ "$Network6Config" == "isStatic" ]]; then
          [[ "$IsCN" == "cn" ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""ipv4_static_ipv6_static_interfaces.cfg" || cloudInitUrl="$ubuntuCloudinitMirror""ipv4_static_ipv6_static_interfaces.cfg"
        fi
      }
      networkAdapter="$interface4"
    elif [[ "$IPStackType" == "IPv6Stack" ]]; then
      if [[ "$Network6Config" == "isDHCP" ]]; then
        if [[ "$IsCN" == "cn" ]]; then
          AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv6_dhcp_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""dhcp_interfaces.cfg"
        else
          AlpineNetworkConf="$alpineNetcfgMirror""ipv6_dhcp_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirror""dhcp_interfaces.cfg"
        fi
      elif [[ "$Network6Config" == "isStatic" ]]; then
        if [[ "$IsCN" == "cn" ]]; then
          AlpineNetworkConf="$alpineNetcfgMirrorCn""ipv6_static_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirrorCn""ipv6_static_interfaces.cfg"
        else
          AlpineNetworkConf="$alpineNetcfgMirror""ipv6_static_interfaces"
          [[ "$targetRelese" == 'Ubuntu' ]] && cloudInitUrl="$ubuntuCloudinitMirror""ipv6_static_interfaces.cfg"
        fi
      fi
      networkAdapter="$interface6"
    fi
    if [[ "$IPStackType" == "BiStack" || "$IPStackType" == "IPv4Stack" ]]; then
# Soft hack of irregular IPv4 configs.
# Reserved empty variables for engineering debugging, if you are not known them well, don't uncomment with them!
      # BurnIrregularIpv4Status='1'
      # ipPrefix=""
      # ipMask=""
      [[ "$BurnIrregularIpv4Status" == "1" ]] && {
        actualIp4Gate="$GATE"
# To add the following soft hacking commands in function "configure_ip()" of the initial file which is dedicated for AlpineLinux can let network service execute immediately at netboot kernel starting,
# it has a similar effect with "d-i preseed/early_command" in the file "preseed.cfg" of Debian series.
# A valid anchor is a comment of "# manual configuration" in this function.
        sed -i '/manual configuration/a\\t\tip link set dev '$interface4' up\n\t\tip addr add '$IPv4'/'$ipPrefix' dev '$interface4'\n\t\tip route add '$actualIp4Gate' dev '$interface4'\n\t\tip route add default via '$actualIp4Gate' dev '$interface4' onlink\n\t\techo '\''nameserver '$ipDNS1''\'' > /etc/resolv.conf\n\t\techo '\''nameserver '$ipDNS2''\'' >> /etc/resolv.conf' /tmp/boot/init
      }
    elif [[ "$IPStackType" == "IPv6Stack" ]]; then
# Attention:
# Configure networking in pure IPv6 or irregular IPv4 environment so that to let AlpineLinux netboot kernel to support to connect to the public network was not recognized by official at current(date 2023.08).
# This is only belonged to an appertain of my ingenuity in this earth. I'm glad to introduce to you without any reservation that how I was accomplished to dealing with it.
# By using "ip link set IPv6 network adaper", "ip -6 add IPv6 address and subnet", "ip -6 route add..." are similar with handling irregular IPv4s.
# For pure IPv6 stack, static network configure method, we need to generate a nonexistent IPv4 configurations to make a cheat to let AlpineLinux to initiate network service.
# For pure IPv6 stack, dhcp network configure method, in most of these environments, upstream networking topology may also has a IPv4 dhcp configuration but server won't get any public IPv4 address acrossing IPv4 route,
# so we need to add IPv6 hijack commands after IPv4 dhcp configure method context after comment of "# automatic configuration" in function of "configure_ip()".
# About deciding to write which different contents of "ip=..." in grub section, "ip=dhcp" is for IPv6 automatic method, for IPv6 manual method is like "ip=172.25.255.72:::255.255.255.0::eth0:::", no matter for menuentry of grub1 or grub2 format are all applicable.
# All of these deceptions of above are only for let AlpineLinux netboot kernel to creating IPv6 network successfully during a temporary AlpineLinux environment in RAM
# when installed as a formal AlpineLinux or Ubuntu or Windows, the networking configure files will be all rewritten so that the "fakeIpv4 ", etc. have no negative impacts to these finally installed target systems.
      if [[ "$Network6Config" == "isStatic" ]]; then
        fakeIpv4="172.25.255.72"
        fakeIpMask="255.255.255.0"
        hackIpv6Context="manual configuration"
      elif [[ "$Network6Config" == "isDHCP" ]]; then
        hackIpv6Context="automatic configuration"
      fi
      sed -i '/'"$hackIpv6Context"'/a\\t\tdepmod\n\t\tmodprobe ipv6\n\t\tip link set dev '$interface6' up\n\t\tip -6 addr add '$ip6Addr'/'$actualIp6Prefix' dev '$interface6'\n\t\tip -6 route add '$ip6Gate' dev '$interface6'\n\t\tip -6 route add default via '$ip6Gate' dev '$interface6' onlink\n\t\techo '\''nameserver '$ip6DNS1''\'' > /etc/resolv.conf\n\t\techo '\''nameserver '$ip6DNS2''\'' >> /etc/resolv.conf' /tmp/boot/init
    fi
    if [[ "$setCloudKernel" == "" ]]; then
      [[ -n "$virtWhat" ]] && virtualizationStatus='1' || virtualizationStatus='0'
    elif [[ "$setCloudKernel" == "1" ]]; then
      virtualizationStatus='1'
    fi
    if [[ "$setMotd" == "1" ]]; then
      ModifyMOTD=`echo -e "rm -rf \\\$sysroot/etc/motd
wget --no-check-certificate -O \\\$sysroot/etc/profile.d/motd.sh \${AlpineMotd}
chmod a+x \\\$sysroot/etc/profile.d/motd.sh"`
    else
      ModifyMOTD=""
    fi
# All the following steps are processed in the temporary Alpine Linux.
    cat <<EOF | sed -i "${AlpineInitLineNum}r /dev/stdin" /tmp/boot/init
# Download "interfaces" templates and replace IP details.
wget --no-check-certificate -O \$sysroot/etc/network/tmp_interfaces ${AlpineNetworkConf}

# Config nameservers
rm -rf \$sysroot/etc/resolv.conf
wget --no-check-certificate -O \$sysroot/etc/resolv.conf ${AlpineDnsFile}
chmod a+x \$sysroot/etc/resolv.conf

# Add customized motd
${ModifyMOTD}

# Creat a modify initial file.
echo '' > \$sysroot/root/alpine.config

# To determine main hard drive.
echo "IncDisk  "${IncDisk} >> \$sysroot/root/alpine.config

# To determine mirror.
echo "LinuxMirror  "${LinuxMirror} >> \$sysroot/root/alpine.config

# To determine release of Alpine Linux
echo "alpineVer  "${DIST} >> \$sysroot/root/alpine.config

# To determine target system mirror.
echo "targetLinuxMirror  "${targetLinuxMirror} >> \$sysroot/root/alpine.config

# To determine Windows network static config file.
echo "windowsStaticConfigCmd  "${windowsStaticConfigCmd} >> \$sysroot/root/alpine.config

# To determine Windows network IPv4 static or dhcp.
echo "Network4Config  "${Network4Config} >> \$sysroot/root/alpine.config

# To determine Windows dd package decompress method.
echo "DEC_CMD  "${DEC_CMD} >> \$sysroot/root/alpine.config

# To determine timezone.
echo "TimeZone  "${TimeZone} >> \$sysroot/root/alpine.config

# To determine root password.
echo 'tmpWORD  '$tmpWORD'' >> \$sysroot/root/alpine.config

# To determine ssh port.
echo "sshPORT  "${sshPORT} >> \$sysroot/root/alpine.config

# To determine network adapter name.
echo "networkAdapter  "${networkAdapter} >> \$sysroot/root/alpine.config

# To determine IPv4 static config
echo "IPv4  "${IPv4} >> \$sysroot/root/alpine.config
echo "MASK  "${MASK} >> \$sysroot/root/alpine.config
echo "ipPrefix  "${ipPrefix} >> \$sysroot/root/alpine.config
echo "actualIp4Prefix  "${actualIp4Prefix} >> \$sysroot/root/alpine.config
echo "actualIp4Subnet  "${actualIp4Subnet} >> \$sysroot/root/alpine.config
echo "GATE  "${GATE} >> \$sysroot/root/alpine.config
echo "actualIp4Gate  "${actualIp4Gate} >> \$sysroot/root/alpine.config
echo "BurnIrregularIpv4Status  "${BurnIrregularIpv4Status} >> \$sysroot/root/alpine.config
echo "ipDNS1  "${ipDNS1} >> \$sysroot/root/alpine.config
echo "ipDNS2  "${ipDNS2} >> \$sysroot/root/alpine.config

# To determine Ipv6 static config
echo "ip6Addr  "${ip6Addr} >> \$sysroot/root/alpine.config
echo "ip6Mask  "${ip6Mask} >> \$sysroot/root/alpine.config
echo "actualIp6Prefix  "${actualIp6Prefix} >> \$sysroot/root/alpine.config
echo "ip6Gate  "${ip6Gate} >> \$sysroot/root/alpine.config
echo "ip6DNS1  "${ip6DNS1} >> \$sysroot/root/alpine.config
echo "ip6DNS2  "${ip6DNS2} >> \$sysroot/root/alpine.config

# To determine whether to disable IPv6 modules
echo "setIPv6  "${setIPv6} >> \$sysroot/root/alpine.config

# To determine hostname
echo "HostName  "${HostName} >> \$sysroot/root/alpine.config

# To determine whether in virtual or physical machine
echo "virtualizationStatus  "${virtualizationStatus} >> \$sysroot/root/alpine.config

# To determine whether configure fail2ban
echo "setFail2banStatus  "${setFail2banStatus} >> \$sysroot/root/alpine.config

# To determine whether to delete motd of original system
echo "setMotd  "${setMotd} >> \$sysroot/root/alpine.config

# To determine dd image url
echo "DDURL  "${DDURL} >> \$sysroot/root/alpine.config

# To determine cloud init url
echo "cloudInitUrl  "${cloudInitUrl} >> \$sysroot/root/alpine.config

# Download initial file.
wget --no-check-certificate -O \$sysroot/etc/local.d/${AlpineInitFileName} ${AlpineInitFile}

# Set initial file execute automatically.
chmod a+x \$sysroot/etc/local.d/${AlpineInitFileName}
ln -s /etc/init.d/local \$sysroot/etc/runlevels/default/
EOF
  fi
elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
  RedHatUrl=""
  RepoBase=""
  RepoAppStream=""
  [[ "$IsCN" == "cn" ]] && RepoEpel="repo --name=epel --baseurl=http://mirrors.ustc.edu.cn/epel/${RedHatSeries}/Everything/${VER}" || RepoEpel="repo --name=epel --mirrorlist=https://mirrors.fedoraproject.org/mirrorlist?repo=epel-${RedHatSeries}&arch=${VER}"
  AuthMethod="authselect --useshadow --passalgo sha512"
  SetTimeZone="timezone --utc ${TimeZone}"
  [[ "$IsCN" == "cn" ]] && FirewallRule="https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/RedHat/RHEL9Public.xml" || FirewallRule="https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/RedHat/RHEL9Public.xml"
  if [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]]; then
    if [[ "$RedHatSeries" -ge "8" ]]; then
      RedHatUrl="url --url=${LinuxMirror}/${DIST}/BaseOS/${VER}/os"
      RepoBase="repo --name=base --baseurl=${LinuxMirror}/${DIST}/BaseOS/${VER}/os"
      RepoAppStream="repo --name=appstream --baseurl=${LinuxMirror}/${DIST}/AppStream/${VER}/os"
    elif [[ "$linux_relese" == 'centos' ]] && [[ "$RedHatSeries" -le "7" ]]; then
      RedHatUrl="url --url=${LinuxMirror}/${DIST}/os/${VER}"
      AuthMethod="auth --useshadow --passalgo=sha512"
      SetTimeZone="timezone --isUtc ${TimeZone}"
      RepoBase="repo --name=base --baseurl=${LinuxMirror}/${DIST}/os/${VER}"
      RepoAppStream="repo --name=updates --baseurl=${LinuxMirror}/${DIST}/updates/${VER}"
      [[ "$IsCN" == "cn" ]] && FirewallRule="https://gitee.com/mb9e8j2/Tools/raw/master/Linux_reinstall/RedHat/RHEL7Public.xml" || FirewallRule="https://raw.githubusercontent.com/leitbogioro/Tools/master/Linux_reinstall/RedHat/RHEL7Public.xml"
    fi
  elif [[ "$linux_relese" == 'fedora' ]]; then
    RedHatUrl="url --url=${LinuxMirror}/releases/${DIST}/Server/${VER}/os"
    RepoBase="repo --name=base --baseurl=${LinuxMirror}/releases/${DIST}/Server/${VER}/os"
    [[ "$IsCN" == "cn" ]] && RepoAppStream="repo --name=updates --baseurl=http://mirrors.bfsu.edu.cn/fedora/updates/${DIST}/Everything/${VER}" || RepoAppStream="repo --name=updates --mirrorlist=https://mirrors.fedoraproject.org/mirrorlist?repo=updates-released-f${DIST}&arch=${VER}"
    [[ "$IsCN" == "cn" ]] && RepoEpel="repo --name=epel --baseurl=http://mirrors.163.com/fedora/releases/${DIST}/Everything/${VER}/os" || RepoEpel="repo --name=epel --mirrorlist=https://mirrors.fedoraproject.org/mirrorlist?repo=fedora-${DIST}&arch=${VER}"
  fi
# If network adapter is redirected, the "eth0" is default.
# --bootproto="a value" is exclusive to IPv4, --bootproto=dhcp is IPv4 DHCP, --bootproto=static is IPv4 Static. 
# --ipv6="a vaild IPv6 address/netmask bits" is for IPv6 static, and then --ipv6gateway="a valid IPv6 gateway" is necessary, --ipv6=auto is for IPv6 DHCP.
# For IPv6 only network environment, no matter dhcp or static, IPv4 configuration must be disabled(--noipv4),
# in this situation, CentOS 7 doesn't accept any IPv4 DNS value.
# Reference: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/system_design_guide/kickstart-commands-and-options-reference_system-design-guide#network_kickstart-commands-for-network-configuration
  writeMultipleIpv4Addresses "$iAddrNum" "" '/etc/NetworkManager/system-connections/'$interface'.nmconnection'
  writeMultipleIpv6Addresses "$i6AddrNum" "" '/etc/NetworkManager/system-connections/'$interface'.nmconnection'
  if [[ "$IPStackType" == "IPv4Stack" ]]; then
    if [[ "$Network4Config" == "isDHCP" ]]; then
      NetConfigManually="network --device=$interface --bootproto=dhcp --ipv6=auto --nameserver=$ipDNS,$ip6DNS --hostname=$(hostname) --onboot=on"
    elif [[ "$Network4Config" == "isStatic" ]]; then
      NetConfigManually="network --device=$interface --bootproto=static --ip=$IPv4 --netmask=$actualIp4Subnet --gateway=$GATE --ipv6=auto --nameserver=$ipDNS,$ip6DNS --hostname=$(hostname) --onboot=on"
    fi
  elif [[ "$IPStackType" == "BiStack" ]]; then
    if [[ "$Network4Config" == "isDHCP" ]] && [[ "$Network6Config" == "isDHCP" ]]; then
      NetConfigManually="network --device=$interface --bootproto=dhcp --ipv6=auto --nameserver=$ipDNS,$ip6DNS --hostname=$(hostname) --onboot=on"
    elif [[ "$Network4Config" == "isDHCP" ]] && [[ "$Network6Config" == "isStatic" ]]; then
      NetConfigManually="network --device=$interface --bootproto=dhcp --ipv6=$ip6Addr/$actualIp6Prefix --ipv6gateway=$ip6Gate --nameserver=$ipDNS,$ip6DNS --hostname=$(hostname) --onboot=on"
# By adding multiple IPv6 addresses is only support these servers which are configurated in IPv4 networking in temporary environment of anaconda during the installation at current.
      [[ "$i6AddrNum" -ge "2" ]] && NetConfigManually="network --device=$interface --bootproto=dhcp --nameserver=$ipDNS --hostname=$(hostname) --onboot=on"
    elif [[ "$Network4Config" == "isStatic" ]] && [[ "$Network6Config" == "isDHCP" ]]; then
      NetConfigManually="network --device=$interface --bootproto=static --ip=$IPv4 --netmask=$actualIp4Subnet --gateway=$GATE --ipv6=auto --nameserver=$ipDNS,$ip6DNS --hostname=$(hostname) --onboot=on"
    elif [[ "$Network4Config" == "isStatic" ]] && [[ "$Network6Config" == "isStatic" ]]; then
      NetConfigManually="network --device=$interface --bootproto=static --ip=$IPv4 --netmask=$actualIp4Subnet --gateway=$GATE --ipv6=$ip6Addr/$actualIp6Prefix --ipv6gateway=$ip6Gate --nameserver=$ipDNS,$ip6DNS --hostname=$(hostname) --onboot=on"
      [[ "$i6AddrNum" -ge "2" ]] && NetConfigManually="network --device=$interface --bootproto=static --ip=$IPv4 --netmask=$actualIp4Subnet --gateway=$GATE --nameserver=$ipDNS --hostname=$(hostname) --onboot=on"
    fi
  elif [[ "$IPStackType" == "IPv6Stack" ]]; then
    if [[ "$Network6Config" == "isDHCP" ]]; then
      NetConfigManually="network --device=$interface --bootproto=dhcp --ipv6=auto --nameserver=$ip6DNS --hostname=$(hostname) --onboot=on --activate --noipv4"
    elif [[ "$Network6Config" == "isStatic" ]]; then
      NetConfigManually="network --device=$interface --bootproto=dhcp --ipv6=$ip6Addr/$actualIp6Prefix --ipv6gateway=$ip6Gate --nameserver=$ip6DNS --hostname=$(hostname) --onboot=on --activate --noipv4"
    fi
  fi
# Recipes for part disk in BIOS or UEFI manually.
# Reference: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/installation_guide/sect-kickstart-syntax
#            https://blog.adachin.me/archives/3621
#            https://www.cnblogs.com/hukey/p/14919346.html
  ksIncDisk=`echo $IncDisk | cut -d'/' -f 3`
  ksAllDisks=`echo $AllDisks | sed 's/\/dev\///g' | sed 's/ /,/g'`
  [[ "$disksNum" -le "1" || "$setDisk" != "all" ]] && {
    clearPart="clearpart --drives=${ksIncDisk} --all --initlabel"
    [[ "$EfiSupport" == "enabled" ]] && FormatDisk=`echo -e "part / --fstype="xfs" --ondisk="$ksIncDisk" --grow --size="0"\npart swap --ondisk="$ksIncDisk" --size="1024"\npart /boot --fstype="xfs" --ondisk="$ksIncDisk" --size="512"\npart /boot/efi --fstype="efi" --ondisk="$ksIncDisk" --size="1024""` || FormatDisk=`echo -e "part / --fstype="xfs" --ondisk="$ksIncDisk" --grow --size="0"\npart swap --ondisk="$ksIncDisk" --size="1024"\npart /boot --fstype="xfs" --ondisk="$ksIncDisk" --size="1024"\npart biosboot --fstype=biosboot --ondisk="$ksIncDisk" --size=1"`
  }
  [[ "$setDisk" == "all" || -n "$setRaid" ]] && {
    clearPart="clearpart --all --initlabel"
    FormatDisk="autopart"
  }
  setRaidRecipe "$setRaid" "$disksNum" "$AllDisks" "$linux_relese"
if [[ "$setAutoConfig" == "1" ]]; then
  cat >/tmp/boot/ks.cfg<<EOF
# platform x86, AMD64, or Intel EM64T, or ARM aarch64
# Firewall configuration
firewall --enabled --ssh

# Use network installation
${RedHatUrl}
${RepoBase}
${RepoAppStream}
${RepoEpel}

# Root password
rootpw --iscrypted ${myPASSWORD}

# System authorization information
${AuthMethod}

# Disable system configuration
firstboot --disable

# System language
lang en_US

# Keyboard layouts
keyboard us

# SELinux configuration
selinux --disabled

# Use text install
text

# unsupported_hardware
# vnc
# dont't config display manager
skipx

# System Timezone
${SetTimeZone}

# Network Configuration
${NetConfigManually}

# System bootloader configuration
bootloader --location=mbr --boot-drive=${ksIncDisk} --append="rhgb quiet crashkernel=auto net.ifnames=0 biosdevname=0 ipv6.disable=1"

# Clear the Master Boot Record
zerombr
${clearPart}

# Disk partitioning information
${FormatDisk}

# Reboot after installation
reboot

%packages --ignoremissing
@^minimal-environment
bind-utils
curl
epel-release
fail2ban
file
lrzsz
net-tools
traceroute
vim
wget
xz

%end

# Enable services
services --enabled=fail2ban,firewalld

# All modified command should only be executed between %post and %end location!
%post --interpreter=/bin/bash

# Disable selinux
sed -ri "/^#?SELINUX=permissive/c\SELINUX=disabled" /etc/selinux/config
sed -ri "/^#?SELINUX=enforcing/c\SELINUX=disabled" /etc/selinux/config

# Allow password login
sed -ri "/^#?PermitRootLogin.*/c\PermitRootLogin yes" /etc/ssh/sshd_config
sed -ri "/^#?PasswordAuthentication.*/c\PasswordAuthentication yes" /etc/ssh/sshd_config

# Change ssh port
sed -ri "/^#?Port.*/c\Port ${sshPORT}" /etc/ssh/sshd_config
rm -rf /etc/firewalld/zones/public.xml
wget --no-check-certificate -qO /etc/firewalld/zones/public.xml '$FirewallRule'
sed -ri 's/port=""/port="${sshPORT}"/g' /etc/firewalld/zones/public.xml
firewall-cmd --reload

# Write fail2ban config
touch /etc/fail2ban/jail.d/local.conf
echo -ne "[DEFAULT]\nbanaction = firewallcmd-ipset\nbackend = systemd\n\n[sshd]\nenabled = true" > /etc/fail2ban/jail.d/local.conf

# Fail2ban config
touch /var/log/fail2ban.log
sed -i -E 's/^(logtarget =).*/\1 \/var\/log\/fail2ban.log/' /etc/fail2ban/fail2ban.conf
systemctl enable fail2ban

# Add multiple IPv4 addresses
${deleteOriginalIpv4Coning}
${addIpv4AddrsForRedhat}

# Add multiple IPv6 addresses
${deleteOriginalIpv6Coning}
${setIpv6ConfigMethodForRedhat}
${addIpv6AddrsForRedhat}

# Clean logs and kickstart files
rm -rf /root/anaconda-ks.cfg
rm -rf /root/install.*log
rm -rf /root/original-ks.cfg

%end

EOF
fi
# If network adapter is not redirected, delete this setting to new system.
  [[ "$setInterfaceName" == "0" ]] && sed -i 's/ net.ifnames=0 biosdevname=0//g' /tmp/boot/ks.cfg
# Support to add --setipv6 "0" to disable IPv6 modules permanently.
  [[ "$setIPv6" == "1" ]] && sed -i 's/ipv6.disable=1//g' /tmp/boot/ks.cfg
  
  [[ "$UNKNOWHW" == '1' ]] && sed -i 's/^unsupported_hardware/#unsupported_hardware/g' /tmp/boot/ks.cfg
  [[ "$(echo "$DIST" |grep -o '^[0-9]\{1\}')" == '5' ]] && sed -i '0,/^%end/s//#%end/' /tmp/boot/ks.cfg
fi

# find . | cpio -H newc --create --verbose | gzip -1 > /tmp/initrd.img
rm -rf /boot/initrd.img
rm -rf /boot/vmlinuz
find . | cpio -o -H newc | gzip -1 > /tmp/initrd.img

# Grub config start
# Debian/Ubuntu/Kali Grub1 set start
if [[ ! -z "$GRUBTYPE" && "$GRUBTYPE" == "isGrub1" ]]; then
  if [[ "$setNetbootXyz" == "0" ]]; then
    READGRUB='/tmp/grub.read'
    [[ -f $READGRUB ]] && rm -rf $READGRUB
    touch $READGRUB
# Backup original grub config file
    cp $GRUBDIR/$GRUBFILE "$GRUBDIR/$GRUBFILE_$(date "+%Y%m%d%H%M").bak"
# Read grub file, search boot item.
#
# Here is the sample of "menuentry" in most regular Debian like Linux releases:
#
# menuentry 'Debian GNU/Linux' {
#   load_video
#   insmod ...
#   if [ x$grub_platform = xxen ]; then insmod ...; fi
#   set root='hd...'
#   if [ x$feature_platform_search_hint = xy ]; then
#	    search --no-floppy --fs-uuid --set=root --hint- ...
#   else
#     search --no-floppy --fs-uuid --set=root some uuid
#   fi
#   echo	'Loading Linux ...'
#	  linux	/boot/vmlinuz
#   echo	'Loading initial ramdisk ...'
#   initrd	/boot/initrd.img
# }
#
# But in Ubuntu series(version 20.04+) of official templates of Amazon Lightsail, there are two "}" in one set of the "menuentry" like:
#
# menuentry 'Ubuntu' {
#   gfxpayload ...
#   insmod ...
#   if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
#   if [ x$feature_platform_search_hint = xy ]; then ...; fi
#   if [ "${initrdfail}" = 1 ]; then
#     linux	/boot/vmlinuz
#     initrd	/boot/initrd.img
#   else
#     ...
#   fi
#   initrdfail
# }
#
# Original regex " grep -om 1 'menuentry\ [^}]*}' " written by "MoeClub" can only matches end to " menuentry 'Ubuntu' {..... if [ "${initrdfail} " so that " grep -om 1 'menuentry\ [^}]*}%%%%%%% " caused "$READGRUB" has nothing.
# That's why we need to add "." to split every regex conditions and delete space lines of "# code comments".
#
# Some grub file is written as a binary file, add parameter "-a, --text" process this file as if it were text; this is equivalent to the --binary-files=text option
    cat $GRUBDIR/$GRUBFILE | sed -n '1h;1!H;$g;s/\n/%%%%%%%/g;$p' | grep -aom 1 'menuentry\ [^{].*{.[^}].*}%%%%%%%' | sed 's/%%%%%%%/\n/g' | grep -v '^#' | sed '/^[[:space:]]*$/d' >$READGRUB
    LoadNum="$(cat $READGRUB | grep -c 'menuentry ')"
    if [[ "$LoadNum" -eq '1' ]]; then
      cat $READGRUB | sed '/^$/d' >/tmp/grub.new;
    elif [[ "$LoadNum" -gt '1' ]]; then
      CFG0="$(awk '/menuentry /{print NR}' $READGRUB | head -n 1)";
      CFG2="$(awk '/menuentry /{print NR}' $READGRUB | head -n 2 | tail -n 1)";
      CFG1="";
      for tmpCFG in `awk '/}/{print NR}' $READGRUB`; do
        [ "$tmpCFG" -gt "$CFG0" -a "$tmpCFG" -lt "$CFG2" ] && CFG1="$tmpCFG";
      done
      [[ -z "$CFG1" ]] && {
        echo -ne "\n[${red}Error${plain}] Read $GRUBFILE.\n";
        exit 1;
      }
      sed -n "$CFG0,$CFG1"p $READGRUB >/tmp/grub.new;
      [[ -f /tmp/grub.new ]] && [[ "$(grep -c '{' /tmp/grub.new)" -eq "$(grep -c '}' /tmp/grub.new)" ]] || {
        echo -ne "\n[${red}Error${plain}] Not configure $GRUBFILE.\n";
        exit 1;
      }
    fi  
    [ ! -f /tmp/grub.new ] && echo -ne "\n[${red}Error${plain}] $GRUBFILE. " && exit 1;
    sed -i "/menuentry.*/c\menuentry\ \'Install OS \[$Relese\ $DIST\ $VER\]\'\ --class debian\ --class\ gnu-linux\ --class\ gnu\ --class\ os\ \{" /tmp/grub.new
    sed -i "/echo.*Loading/d" /tmp/grub.new;
    INSERTGRUB="$(awk '/menuentry /{print NR}' $GRUBDIR/$GRUBFILE|head -n 1)"
  
    [[ -n "$(grep 'linux.*/\|kernel.*/' /tmp/grub.new |awk '{print $2}' |tail -n 1 |grep '^/boot/')" ]] && Type='InBoot' || Type='NoBoot';
  
    LinuxKernel="$(grep 'linux.*/\|kernel.*/' /tmp/grub.new |awk '{print $1}' |head -n 1)";
    [[ -z "$LinuxKernel" ]] && echo -ne "\n${red}Error${plain} read grub config!\n" && exit 1;
    LinuxIMG="$(grep 'initrd.*/' /tmp/grub.new |awk '{print $1}' |tail -n 1)";
    [ -z "$LinuxIMG" ] && sed -i "/$LinuxKernel.*\//a\\\tinitrd\ \/" /tmp/grub.new && LinuxIMG='initrd';
# If network adapter need to redirect eth0, eth1... in new system, add this setting in grub file of the current system for netboot install file which need to be loaded after restart.
# The same behavior for grub2.
    [[ "$setInterfaceName" == "1" ]] && Add_OPTION="$Add_OPTION net.ifnames=0 biosdevname=0" || Add_OPTION="$Add_OPTION"
    [[ "$setIPv6" == "0" ]] && Add_OPTION="$Add_OPTION ipv6.disable=1" || Add_OPTION="$Add_OPTION"

    if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'ubuntu' ]] || [[ "$linux_relese" == 'kali' ]]; then
# The method for Debian series installer to search network adapter automatically is to set "d-i netcfg/choose_interface select auto" in preseed file.
# The same behavior for grub2.
      BOOT_OPTION="auto=true $Add_OPTION hostname=$(hostname) domain=$linux_relese quiet"
    elif [[ "$linux_relese" == 'alpinelinux' ]]; then
# Reference: https://wiki.alpinelinux.org/wiki/PXE_boot
# IPv4 dhcp config:
# ip=dhcp or not assign it.
# Allow a valid IPv4 static config:
# ip=client-ip::geteway:mask::adapter::dns:
# Sample:
# ip=179.86.100.76::179.86.100.1:255.255.255.0::eth0::1.0.0.1 8.8.8.8:
# Any of IPv6 address format can't be recognized.
      if [[ "$IPStackType" == "BiStack" || "$IPStackType" == "IPv4Stack" ]]; then
        [[ "$Network4Config" == "isStatic" ]] && Add_OPTION="ip=$IPv4::$GATE:$MASK::$interface4::$ipDNS:" || Add_OPTION="ip=dhcp"
        [[ "$BurnIrregularIpv4Status" == "1" ]] && Add_OPTION="ip=$IPv4:::$ipMask::$interface4::$ipDNS:"
      elif [[ "$IPStackType" == "IPv6Stack" ]]; then
        [[ "$Network6Config" == "isStatic" ]] && Add_OPTION="ip=$fakeIpv4:::$fakeIpMask::$interface6:::" || Add_OPTION="ip=dhcp"
      fi
      BOOT_OPTION="alpine_repo=$LinuxMirror/$DIST/main/ modloop=$ModLoopUrl $Add_OPTION"
    elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
      ipv6ForRedhatGrub
# The method for Redhat series installer to search network adapter automatically is to set "ksdevice=link" in grub file of the current system for netboot install file which need to be loaded after restart.
# The same behavior for grub2.
# "ksdevice=interface" will be deprecated in future versions of anaconda.
# Reference: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/performing_an_advanced_rhel_8_installation/kickstart-and-advanced-boot-options_installing-rhel-as-an-experienced-user
      BOOT_OPTION="inst.ks=file://ks.cfg $Add_OPTION inst.nomemcheck quiet $ipv6StaticConfForKsGrub"
    fi
    [[ "$setAutoConfig" == "0" ]] && sed -i 's/inst.ks=file:\/\/ks.cfg//' $GRUBDIR/$GRUBFILE
    
    [ -n "$setConsole" ] && BOOT_OPTION="$BOOT_OPTION --- console=$setConsole"
  
    [[ "$Type" == 'InBoot' ]] && {
      sed -i "/$LinuxKernel.*\//c\\\t$LinuxKernel\\t\/boot\/vmlinuz $BOOT_OPTION" /tmp/grub.new;
      sed -i "/$LinuxIMG.*\//c\\\t$LinuxIMG\\t\/boot\/initrd.img" /tmp/grub.new;
    }
    [[ "$Type" == 'NoBoot' ]] && {
      sed -i "/$LinuxKernel.*\//c\\\t$LinuxKernel\\t\/vmlinuz $BOOT_OPTION" /tmp/grub.new;
      sed -i "/$LinuxIMG.*\//c\\\t$LinuxIMG\\t\/initrd.img" /tmp/grub.new;
    }

    sed -i '$a\\n' /tmp/grub.new;
  
    sed -i ''${INSERTGRUB}'i\\n' $GRUBDIR/$GRUBFILE;
    sed -i ''${INSERTGRUB}'r /tmp/grub.new' $GRUBDIR/$GRUBFILE;
    [[ -f  $GRUBDIR/grubenv ]] && sed -i 's/saved_entry/#saved_entry/g' $GRUBDIR/grubenv;
# Debian/Ubuntu grub1 set end
  elif [[ "$setNetbootXyz" == "1" ]]; then
    grub-mkconfig -o $GRUBDIR/$GRUBFILE >>/dev/null 2>&1
    grub-set-default "Bootable ISO Image: netboot.xyz" >>/dev/null 2>&1
    grub-reboot "Bootable ISO Image: netboot.xyz" >>/dev/null 2>&1
  fi
elif [[ ! -z "$GRUBTYPE" && "$GRUBTYPE" == "isGrub2" ]]; then
  if [[ "$setNetbootXyz" == "0" ]]; then
# RedHat grub2 set start
# Confirm linux and initrd kernel direction
    if [[ -f /boot/grub2/grubenv ]] && [[ -d /boot/loader/entries ]] && [[ "$(ls /boot/loader/entries | wc -w)" != "" ]]; then
      LoaderPath=$(cat /boot/grub2/grubenv | grep 'saved_entry=' | awk -F '=' '{print $2}')
      LpLength=`echo ${#LoaderPath}`
      LpFile="/boot/loader/entries/$LoaderPath.conf"
# The saved_entry of OpenCloudOS(Tencent Cloud) is equal "0"
# [root@VM-4-11-opencloudos ~]# cat /boot/grub2/grubenv
# GRUB Environment Block
# saved_entry=0
# kernelopts=root=UUID=c21f153f-c0a8-42db-9ba5-8299e3c3d5b9 ro quiet elevator=noop console=ttyS0,115200 console=tty0 vconsole.keymap=us crashkernel=1800M-64G:256M,64G-128G:512M,128G-:768M vconsole.font=latarcyrheb-sun16 net.ifnames=0 biosdevname=0 intel_idle.max_cstate=1 intel_pstate=disable iommu=pt amd_iommu=on 
# boot_success=0
      if [[ "$LpLength" -le "1" ]] || [[ ! -f "$LpFile" ]]; then
        LpFile=`ls -Sl /boot/loader/entries/ | grep -wv "*rescue*" | awk -F' ' '{print $NF}' | sed -n '2p'`
        [[ "$(cat /boot/loader/entries/$LpFile | grep '^linux /boot/')" ]] && BootDIR='/boot' || BootDIR=''
      else
        [[ "$(cat $LpFile | grep '^linux /boot/')" ]] && BootDIR='/boot' || BootDIR=''
      fi
    else
      [[ -n "$(grep 'linux.*/\|kernel.*/' $GRUBDIR/$GRUBFILE | awk '{print $2}' | tail -n 1 | grep '^/boot/')" ]] && BootDIR='/boot' || BootDIR=''
    fi
# Confirm if BIOS or UEFI firmware for architecture of x86_64(AMD64) processors.
    if [[ "$VER" == "x86_64" || "$VER" == "amd64" ]]; then
      [[ "$EfiSupport" == "enabled" ]] && BootHex="efi" || BootHex="16"
# The architecture of aarch64(ARM64) processors have matched for only UEFI firmware even nowadays.
    elif [[ "$VER" == "aarch64" || "$VER" == "arm64" ]]; then
      BootHex=""
    fi
# Get main menuentry parameter from current system
    CFG0="$(awk '/insmod part_/{print NR}' $GRUBDIR/$GRUBFILE|head -n 1)"
    CFG2tmp="$(awk '/--fs-uuid --set=root/{print NR}' $GRUBDIR/$GRUBFILE|head -n 2|tail -n 1)"
    CFG2=`expr $CFG2tmp + 1`
    CFG1=""
    for tmpCFG in `awk '/fi/{print NR}' $GRUBDIR/$GRUBFILE`; do
      [ "$tmpCFG" -ge "$CFG0" -a "$tmpCFG" -le "$CFG2" ] && CFG1="$tmpCFG"
    done
    if [[ -z "$CFG1" ]]; then
# In standard Redhat like linux OS with grub2 above version of 7, the OS boot configuration in "grub.cfg" is like:
#
# insmod part_msdos
# insmod xfs
# set root='hd0,msdos1'
# if [ x$feature_platform_search_hint = xy ]; then
#   search --no-floppy --fs-uuid --set=root --hint='hd0,msdos1'  d34311d7-62fd-419e-8f19-71494c773ddd
# else
#   search --no-floppy --fs-uuid --set=root d34311d7-62fd-419e-8f19-71494c773ddd
# fi
#
# But in RockyLinux 9.1 of official templates in Oracle Cloud, OVH Cloud etc, the boot configuration in "grub.cfg" is different from any other of Redhat release versions compeletely:
#
# insmod part_gpt
# insmod xfs
# search --no-floppy --fs-uuid --set=root 11000e8c-9777-43c3-a83b-54a13d609fdb
# insmod part_gpt
# insmod fat
# search --no-floppy --fs-uuid --set=boot 9E70-9B63
#
# In CentOS 7, Fedora 36+, AlmaLinux/CentOS-stream/RockyLinux 8+ of official templates in Linode, all the samples are the same:
#
# insmod part_msdos
# insmod ext2
# set root='hd0,gpt2'
# insmod part_msdos
# insmod ext2
# set boot='hd0,gpt2'
#
# Only the following method will effective:
#
# The expect component in grub file should be like "search --no-floppy --fs-uuid --set=root 9340b3c7-e898-44ae-bd1e-4c58dec2b16d" or "set boot='hd0'".
      SetRootCfg="$(awk '/--fs-uuid --set=root/{print NR}' $GRUBDIR/$GRUBFILE | head -n 2 | tail -n 1)"
      [[ "$SetRootCfg" == "" ]] && SetRootCfg="$(awk '/set root='\''hd[0-9]/{print NR}' /boot/grub2/grub.cfg | head -n 2 | tail -n 1)"
# An array for depositing all rows of "insmod part_".
      InsmodPartArray=()
# An array for row number of "search --no-floppy --fs-uuid --set=root..." minus row number of "insmod part_".
      IpaSpace=()
# Static how many times does "insmod part_" appeared and storage rows in array of "InsmodPartArray",
# storage minus rows in arrary of "IpaSpace"
      for tmpCFG in `awk '/insmod part_/{print NR}' $GRUBDIR/$GRUBFILE`; do
        InsmodPartArray+=("$tmpCFG" "$InsmodPartArray")
# One number of row minus another one shouldn't be less than "0".
        [[ `expr $SetRootCfg - $tmpCFG` -gt "0" ]] && IpaSpace+=(`expr "$SetRootCfg" - "$tmpCFG"` "$IpaSpace")
      done
# Definite order "0" in "IpaSpace" as a default value of variable of "minArray".
      minArray=${IpaSpace[0]}
# The outer condition of this cycle is to definite how many times does it will execute.
      for ((i=1;i<=`grep -io "insmod part_*" $GRUBDIR/$GRUBFILE | wc -l`;i++)); do
# The inner condition of this cycle is the orders in array of "IpaSpace".
        for j in ${IpaSpace[@]}; do
# A typical buddle sort for compare whether the current variable "minArray" is greater than the order of number in "IpaSpace" of current cycle.
# If "minArray" is greater than the order "j" in array of "IpaSpace", the less one "j" will replace the former "IpaSpace".
          [[ $minArray -gt $j ]] && minArray=$j
        done
      done
# The least "minArray" will be the result and once it plus "SetRootCfg" will be the nearest row number of "insmod part_".
# So we can figure out the valid section of boot configuration in "grub.cfg" like:
#
# insmod part_gpt
# insmod xfs
# search --no-floppy --fs-uuid --set=root 9340b3c7-e898-44ae-bd1e-4c58dec2b16d
#
      CFG0=`expr $SetRootCfg - $minArray`
      CFG1="$SetRootCfg"
    fi
    [[ -z "$CFG0" || -z "$CFG1" ]] && {
      echo -ne "\n[${red}Error${plain}] Read $GRUBFILE.\n"
      exit 1
    }
    sed -n "$CFG0,$CFG1"p $GRUBDIR/$GRUBFILE >/tmp/grub.new
    sed -i -e 's/^/  /' /tmp/grub.new
    [[ -f /tmp/grub.new ]] && [[ "$(grep -c '{' /tmp/grub.new)" -eq "$(grep -c '}' /tmp/grub.new)" ]] || {
      echo -ne "\n[${red}Error${plain}] Not configure $GRUBFILE. \n"
      exit 1
    }
    [ ! -f /tmp/grub.new ] && echo -ne "\n[${red}Error${plain}] $GRUBFILE.\n" && exit 1
# Set IPv6 or distribute unite network adapter interface
    [[ "$setInterfaceName" == "1" ]] && Add_OPTION="net.ifnames=0 biosdevname=0" || Add_OPTION=""
    [[ "$setIPv6" == "0" ]] && Add_OPTION="$Add_OPTION ipv6.disable=1" || Add_OPTION="$Add_OPTION"
# Write menuentry to grub
    if [[ "$linux_relese" == 'ubuntu'  || "$linux_relese" == 'debian' || "$linux_relese" == 'kali' ]]; then
      BOOT_OPTION="auto=true $Add_OPTION hostname=$(hostname) domain=$linux_relese quiet"
    elif [[ "$linux_relese" == 'alpinelinux' ]]; then
      if [[ "$IPStackType" == "BiStack" || "$IPStackType" == "IPv4Stack" ]]; then
        [[ "$Network4Config" == "isStatic" ]] && Add_OPTION="ip=$IPv4::$GATE:$MASK::$interface4::$ipDNS:" || Add_OPTION="ip=dhcp"
        [[ "$BurnIrregularIpv4Status" == "1" ]] && Add_OPTION="ip=$IPv4:::$ipMask::$interface4::$ipDNS:"
      elif [[ "$IPStackType" == "IPv6Stack" ]]; then
        [[ "$Network6Config" == "isStatic" ]] && Add_OPTION="ip=$fakeIpv4:::$fakeIpMask::$interface6:::" || Add_OPTION="ip=dhcp"
      fi
      BOOT_OPTION="alpine_repo=$LinuxMirror/$DIST/main/ modloop=$ModLoopUrl $Add_OPTION"
    elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
      ipv6ForRedhatGrub
      BOOT_OPTION="inst.ks=file://ks.cfg $Add_OPTION inst.nomemcheck quiet $ipv6StaticConfForKsGrub"
    fi
    [[ "$setAutoConfig" == "0" ]] && sed -i 's/inst.ks=file:\/\/ks.cfg//' $GRUBDIR/$GRUBFILE
    cat >> /etc/grub.d/40_custom <<EOF
menuentry 'Install $Relese $DIST $VER' --class $linux_relese --class gnu-linux --class gnu --class os {
  load_video
  set gfxpayload=text
  insmod gzio
$(cat /tmp/grub.new)
  linux$BootHex $BootDIR/vmlinuz $BOOT_OPTION
  initrd$BootHex $BootDIR/initrd.img
}
EOF
# Make grub2 to prefer installation item to boot first.
    sed -ri 's/GRUB_DEFAULT=0/GRUB_DEFAULT=saved/g' /etc/default/grub
# Refreshing current system grub2 service
    grub2-mkconfig -o $GRUBDIR/$GRUBFILE >>/dev/null 2>&1
    grub2-set-default "Install $Relese $DIST $VER" >>/dev/null 2>&1
    grub2-reboot "Install $Relese $DIST $VER" >>/dev/null 2>&1
# RedHat grub set end
  elif [[ "$setNetbootXyz" == "1" ]]; then
    grub2-mkconfig -o $GRUBDIR/$GRUBFILE >>/dev/null 2>&1
    grub2-set-default "Bootable ISO Image: netboot.xyz" >>/dev/null 2>&1
    grub2-reboot "Bootable ISO Image: netboot.xyz" >>/dev/null 2>&1
  fi
fi
# Grub config end

if [[ "$loaderMode" == "0" ]]; then
  # sleep 5 && reboot || sudo reboot >/dev/null 2>&1
  cp -f /tmp/initrd.img /boot/initrd.img || sudo cp -f /tmp/initrd.img /boot/initrd.img
  cp -f /tmp/vmlinuz /boot/vmlinuz || sudo cp -f /tmp/vmlinuz /boot/vmlinuz
  chown root:root $GRUBDIR/$GRUBFILE
  chmod 444 $GRUBDIR/$GRUBFILE
else
  rm -rf "$HOME/loader"
  mkdir -p "$HOME/loader"
  cp -rf "/tmp/initrd.img" "$HOME/loader/initrd.img"
  cp -rf "/tmp/vmlinuz" "$HOME/loader/vmlinuz"
  [[ -f "/tmp/initrd.img" ]] && rm -rf "/tmp/initrd.img"
  [[ -f "/tmp/vmlinuz" ]] && rm -rf "/tmp/vmlinuz"
  echo && ls -AR1 "$HOME/loader"
fi

[[ "$setAutoConfig" != "0" || "$setNetbootXyz" != "1" || "$loaderMode" == "0" ]] && {
  echo -ne "\n${aoiBlue}# Directory of Grub and Unattended Disposition File${plain}\n\n"
  echo "$GRUBDIR/$GRUBFILE"
  if [[ "$linux_relese" == 'debian' ]] || [[ "$linux_relese" == 'kali' ]]; then
    echo "/tmp/boot/preseed.cfg"
  elif [[ "$linux_relese" == 'centos' ]] || [[ "$linux_relese" == 'rockylinux' ]] || [[ "$linux_relese" == 'almalinux' ]] || [[ "$linux_relese" == 'fedora' ]]; then
    echo "/tmp/boot/ks.cfg"
  elif [[ "$linux_relese" == 'alpinelinux' ]]; then
    echo "/tmp/boot/init"
  fi
}

echo -ne "\n[${green}Finish${plain}] Input '${yellow}reboot${plain}' to continue the subsequential installation.\n"
exit 1
